I've lost a camera app on my iPhone when I upgraded it, I can't remember the name of the app but I really want it back. I'll describe the app and see if anyone knows it or if it rings a bell :-)
It lets you make a king of animated gif and you can paint out part of the photo, so it lets you take a little movie but then out of some of the frames you can paint out the subject, so for example you can have a line on the ground and someone can 'vanish' as they pass through the line because you can tell it to not modify the image beyond that point. It's hard to explain so this is a long shot, maybe someone will know though :-/
Another example might be you could run behind a tree and as you went behind the tree you would not appear on the other side of it, it would be like you've vanished :-P It's great fun but I can't remember the stupid name of the damn thing now :-(
Thanks if you can.