Teenage pranks
A mate of mine once had a party while his parents were away - usual teenage stuff - and some of us decided it would be fun to hide empty cans across the house. Having hid 11, we dutifully informed him that we'd hidden 12 and went off.

By the end of that Sunday, he'd found all of them and was going mental looking for the twelfth.
(uncle whippity, Wed 19 Dec 2007, 16:54, 2 replies)

this is an old one
I first heard this as somebody had let loose 5 pigs into the halls of residence and had painted the numbers 1, 2, 3, 4 and 6 onto the back of each of them.
( turb0t, Wed 19 Dec 2007, 17:38, closed)

.
That's beautiful in its simplicity.
(misanthrope is so adjective he's verbing nouns!, Thu 20 Dec 2007, 10:00, closed)