Calvin and Hobbes by Bill Watterson for July 18, 1987
Calvin: My best friend betrays me! Susie drenched me with my own teammate's water balloon! Some buddy you are. You Benedict Arnold! Hobbes: Hmph, I'd do it again in a minute. Susie likes my jams. Calvin: Don't even talk to me! You and I are through! Hobbes: Ha! Promises, promises! Susie: Um... I take it the game is over. Calvin: Get this traitor off me. He cheats when he fights, too.