In our student hall we had those cheapo carpet tiles. When a friend went away for a long weekend, his `drinking pals’ broke in, flooded his carpet and spread about a sack full of cress seeds. One hour before he returned they `borrowed’ a sheep (fromm agric. or vet. — I can’t remember) and put it in his room to grazed. The they then set up0 a camera to take a picture of the surrounding scene 3 seconds after the door was opened. You’ve never seen such a funny expression.