Many people think I'm kidding when I say I have a problem with names. Or if not kidding, they think it's just an excuse for not being bothered to do research (although they might have a point there).

However, case in point illustrates just how stupid my brain really is. Somewhere before Christmas, despite the fact that they're labelled differently in my email program, send in their pictures using different methods, and were both on the leaderboard as separate people, my brain decided that Sister Chastity and Karen were the same person. It didn't matter what evidence was presented to it, as soon as Karen sent in a picture, it ended up in Sister Chastity's pile and I even replied to her emails as though she were Sister Chastity, despite the fact she came up as "Karen" rather than "Sister Chastity".

See? Messed up.

Now, that didn't affect last year's scoring any, but it's obviously left Karen a bit behind this year. Apologies to Karen and everyone involved – I truly am a spanner.

So for one week and one week only, we have a very special "Karen Sitting Tennant" Monday (we'll see about Friday), to enable her to catch up and get her total to where it should be.

Feast your eyes on the pics above: they're all from her, which means the picture leaderboard now looks like this.

1. Rullsenberg: 45
2. Toby, Sister Chastity: 35
3. Sabine, Karen: 25
4. Erin C: 10

To prevent my messed up brain from doing similar in future, I've a big ask for picture contributors – in future, no matter how you provide your pics, can you include your name in the filename please (eg RobSittingTennant5.jpg)? It'll help prevent this kind of thing from happening again (probably). Oh, and picture contributors – please be vigilant and make sure I'm not ignoring you or wrongly attributing pics as well? Thanks.

Anyway, don't forget Friday's caption competition!

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

I feel this is almost a sequel to last week's. Ms Rullsenberg gets the points for top pic of the week this week, which neatly catapults her into the lead.

We'll have a very special edition of Sitting Tennant on Monday, for reasons that can best be summed up as "Rob is a spanner". Brace yourself for that.

1. Rullsenberg: 45
2. Toby, Sister Chastity: 35
3. Sabine: 25
4. Erin C: 10

Meanwhile, over in Sitting Caption land, oh no, it's happened again. Three captions, two from Rullsenberg, one from Toby. Were you all feeling a bit feverish or something? Nevertheless, Tobe's won through with his caption, so he gets the shiny ten points. I hope you all feel more inspired this time!

1. Jane Henry: 25
2. Rullsenberg, Toby: 20
3. Sabine: 15
4. kellyann06: 10
5. Electric Dragon, Sister Chastity: 5

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

Three pics, four people: it can only mean one thing – Rullsenberg and Sister Chastity are doubling up again. But Toby and Sabine have provided some lovely pics, as well, so I hope you don't feel short-changed.

1. Toby, Sister Chastity, Rullsenberg: 35
2. Sabine: 25
3. Erin C: 10

Don't forget Friday's caption competition.

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

I feel like David Coleman on Question of Sport: "Errrrrrr, what happened next?"

This week's pic was provided by Ms Rullsenberg, which means we now have three leaders on the leaderboard.

1. Toby, Sister Chastity, Rullsenberg: 30
2. Sabine: 20
3. Erin C: 10

Points for top caption of the week goes to new arrival kellyann06 so a great big well done to her, and commiserations and five points to everyone who took part. Good luck to you all this week.

1. Jane Henry: 25
2. Rullsenberg, Sabine: 15
3. Toby, kellyann06: 10
4. Electric Dragon, Sister Chastity: 5

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

Two lovely pictures of David Tennant sitting down from four equally lovely people. How does that math work? The same pic from three people. Great Tennant-lovers think alike.

1. Toby, Sister Chastity: 30
2. Sabine, Rullsenberg: 20

Don't forget Friday's caption competition.

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

Everyone give a great big welcome to Erin C, our latest Sitting Tennant picture provider who's stormed into action with this great picture of David Tennant on the way to his Saturday job, whatever that is. Thank her kindly, for she clearly has what it takes!

1. Toby, Sister Chastity: 25
2. Sabine, Rullsenberg: 15
3. Erin C: 10

Over in caption land, plans to introduce Sits On Smith have been aborted since everyone's regained their Klingon fighting spirit and pulled some great captions out of their hats (or wherever they keep their ideas machines). I'm awarding top caption points to both Sabine and Jane Henry, since they made me laugh equally. Well done, everyone! David still loves you.

1. Jane Henry: 20
2. Rullsenberg, Sabine: 10
3. Toby, Electric Dragon, Sister Chastity: 5

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

A little later than normal this week, here are four lovely pictures of David Tennant sitting down for your enjoyment. Enjoy!

1. Toby, Sister Chastity: 25
2. Sabine, Rullsenberg: 15

Don't forget Friday's caption competition.

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

It's a joint winner in the picture competition this week, since both (more or less) Sabine and Sister Chastity provided this delightful treat for y'all. Thank them both kindly. Good luck to everyone next week!

1. Toby, Sister Chastity: 20
2. Sabine, Rullsenberg: 10

In the first caption competition of the year, oh dear God, what happened? Two people? Only two people captioning? Don't you love him any more? At this rate, we're going to have to phase out Sitting Tennant in favour of Sittings on Smith (in which various people sit on Matt Smith) – is that what you want?

Low entry rate aside, congratulations to Jane Henry, who gets 10 points for her caption, while Rullsenberg gets a very respectable five for taking part. Well done the both of you – he loves you best, you know.

1. Jane Henry: 10
2. Rullsenberg: 5

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

It's Monday, so here are three lovely pictures provided by our usual trio – now's the time, everyone else, to stop them building up a lead, so send your pics in now!

1. Toby: 20
2. Sister Chastity, Rullsenberg: 10

Don't forget Friday's caption competition.

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.

Here it is. Get your thinking caps ready because here for your delight, courtesy of Toby, is the first captionable Sitting Tennant of 2010. It's entitled Touchstone, so I'm guessing David Tennant is playing Touchstone in As You Like It, rather than auditioning to be the official mascot of Touchstone Pictures (now ABC Studios). But your captions may disagree.

Anyway, here's the pictureboard at the end of week one

1. Toby: 15
2. Sister Chastity, Rullsenberg: 5

Caption away, my friends.

Got a picture of David Tennant sitting, lying down or in some indeterminate state in between? Then leave a link to it below or email me and if it's judged suitable, it will appear in the “Sitting Tennant” gallery.

Every photo displayed on Monday (one per person who sends one in) gets five points; the best pic in the stash each week will appear on Friday and get ten points.

You can also enter the witty and amusing captions league table by commenting on Friday's Sitting Tennant photo, the best caption getting 10 points, everyone who contributes getting five points.