Calvin and Hobbes by Bill Watterson for July 05, 1987
Transcript:
Calvin: The dreaded scum beings fire! Spaceman Spiff is hit! It never fails, I just washed and waxed this thing. Our hero, the intrepid Spaceman Spiff, struggles with the control of his damaged spacecraft! The freem propulsion blasters are useless! Spiff crashed onto the surface of an alien planet! Unscathed, the fearless space explorer emerges from the smoldering wreckage! He is marooned on a hostile world! Scorched by twin suns, the planet is nothing but barren rock and methane! There's no hope of finding food or water! Spiff collapses! Oh no, a hideous alien spots him! In his weakened state, Spiff is no match for the monster! This could be the end!! Lunchtime! Mom: I brought you a sandwich and some lemonade. Bring the dishes back when you're done, ok? Calvin: Oh, well. Thanks, Mom.
Oh, so THIS is where the “I just washed and waxed this thing” line is from.