Jello: a mildly cruel game played in the backseat of a car. It requires at least two people (three is best) and a bench-type seat. When the car turns a corner, the person on the inside of the turn yells "JELLO!" and slams purposefully and violently into the person on the outside. It is not a good idea to initiate a game of Jello if you are the weakest of the participants. Although it can easily turn malicious, Jello is usually a fair game - everyone gets jello'd into at some point. (I suppose in England this would be called "jelly," unless things have changed since I was there last...)