Calvin and Hobbes by Bill Watterson for October 25, 1989
Calvin: Want to play a great game I invented? Hobbes: Ok. Calvn: It's called "gross out." You say the grossest thing you can imagine and then I try to think of something even grosser. Whoever comes up with the grossest thing gets a point, and we play until someone gets 50 points, Ok? Hobbes: I think I already know who's going to win. Calvin: It's weird. Nobody had ever played a whole game with me.