The old Wrigleys packs of chewing gum used to have 3 pictures on the back, one of a pair of lips, one of an envelope (no idea why) and one of a man putting litter in a bin. Tear the wrapper into three, mix them up and predict a friend's romantic future.

If you pick the piece of paper with the lips on, then someone's going to kiss you. If you get the envelope, someone's going to write you a love letter. If you get the bin, you're going to get dumped, which doesn't really work if you were single, but such is the scrambled logic of the hormonal pre-teen.