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.

Related entries

• February 26, 2010: Friday's Sitting Tennant (week 8, 2010)
  Friday's pictures of David Tennant sitting down