Calvin and Hobbes by Bill Watterson for November 15, 1989
Transcript:
Calvin: Having my personal gravity polarity recersed is a real nuisance. How an I going to get up to the floor? There's not anytnig on the ceiling that I could even climb up. How am I supposed to do my homework when I'm trapped on the ceiling? It's impossible.
And behind him happens to be curtains, which he could use to climb down :D