Calvin and Hobbes by Bill Watterson for May 05, 1990
Hobbes: It's Saturday! What do you want to do? Calvin: Anything but play an organized sport. Hobbes: Want to play Calvinball? Calvin: Yeah! Hobbes: No sport is less organized than Calvinball! Calvin: New rule! New rule! If you don't touch the 30-yard base wicket with the flag, you have to hop on one foot!