Calvin and Hobbes by Bill Watterson for July 19, 1987
Calvin: Can you believe this? Some idiot tossed garbage here in this beautiful spot. I'll bet future civilzations find out more about us than we'd like them to know. Look, another can thrown on the ground! Boy, this makes me mad! By golly, if people aren't burning toxic wastes or testing nuclear weapons, they're throwing trash everywhere! You'd think planets like this were a dime a dozen! Now, I've got to carry this gross thing. Hobbes: You know, there are times when it's a source of personal pride to not be human. Calvin: I'm with you.