Calvin and Hobbes by Bill Watterson for September 23, 1988
Calvin: Yep, Mars may be a little dull, but it's better than Earth. We've got a whole planet to outselves. Brand new and unspoiled. No people, no pollution. Nothing but rugged, natural beauty as far as the eye can see. Hobbes: That's not your candy bar wrapper over there, is it? Calvin: It was just there a minute! I wasn't going to leave it.