FoxTrot by Bill Amend for November 29, 1988
Jason: Haha. I wrote a secret message and you can't read it! Paige: What's it say? Jason: You'll never know. Paige: Gimme that. Jason: The captain marvelous code employs the most sophisticated encryption algorythms ever developed. It can't be cracked. Paige: It says "Paige is a fathead." Jason: That was a lucky guess, right? I mean it had to be a lucky guess... Paige: You'll never know.