Calvin and Hobbes by Bill Watterson for April 28, 1986
Calvin: Fearless Spaceman Spiff closes in on the fleeing zargons! Once again our hero is about to teach vicious alien scum that virtue is its own reward! He locks onto target! Susie: Psst, Calvin! What was teh capital of Poland until 1600? Calvin: Krakow. Susie: Thanks. Calvin: Krakow! Krakow! Two direct hits!