Calvin and Hobbes by Bill Watterson for April 09, 1995
Transcript:
Mom: Get going, or you'll miss the school bus. Calvin: Uh...Greetings. My name is Calvin. Alien Calvin: Grittings. Ma nahm is Kahlfin. Grittings. My nahm is Kahlfin. Calvin: Um. Yes! Well Calvin, here's you lunchbox. Have a good day at school. Alien Calvin: Hoffa gud tay. Lunboks. Susie: Hi Calvin. Alien Calvin: Grittings. My nahm is Kahlfin. Heeryor lunboks. Hoffa gud tay askool. Mom: Calvin's principal says to say hello. Dad: Huh boy. Alien Calvin: It troo. Dat darn Kahlfin stole ma spacechip!
So I’m betting much of this was Calvin’s imagination, and in the last panel, that’s the “real world” with the real Calvin pretending to be the alien duplicate.