The Duplicator Story.
Some of the stories told in this strip last weeks, and this was one of them. Calvin and Hobbes isn't particularly unique in this respect; after all, the last ten years of "Funky Winkerbean" have chronicled him making his bed. Calvin and Hobbes stories are so great because they give the strip the opportunity to spin completely out of control.
In this story, Calvin invents a device which allows him to instantly duplicate himself. His intent is to create a clone that will do all the hard work for him, but hell unleashes when he realizes that the clone, being exactly like him, is just as much of an asshole as he is. Calvin #2 manages to create Calvins #3-6, and they all cause chaos because they know that Calvin #1 will have to pay for it. It's just about the best alibi a kid could have. It probably reaches its climax when Calvin's mom sees #4 glued to the television when he's supposed to be doing chores and yells, "What are you doing watching TV?" #4 replies casually, "Why, are you taking a survey?" If I had responded like that to either of my parents when I was a kid, they would have shot me in the kneecap.
Needless to say, this is where we got the name of this website from.