I have videos on my camera that aren't supposed to be there anymore. Because I deleted them!
The mistake I made was deleting them not when the card was in the camera but in the computer. Then I put the card back into the camera and the videos where still there, but instead of a cap there's the text saying "This film can't be played". Which isn't the big problem. The real problem is that when I try to delete such a video from the camera, for the same reason it can't be played, it can't be deleted! Argh!
So I put the card in the computer again and looked for connected files in other folders and deleted them. But the borked videos are still on the camera. Dammit!

I'll have to delete the whole damn card after the next time I save the new pictures to my computer. Or I don't wait until my friends have seen the Edinburgh photos/videos, I save the new pics now, delete the whole card and then put the Edinburgh photos and videos back on the card (because it's the only card big enough, it won't all fit on the 1GB stick). Too much work, argh!