Calvin and Hobbes - Duplicator Machine / Clone - by Bill Watterson for January 11, 1990
Calvin: The duplicator worked! Hobbes meet my duplicate! Hey, nice room. Hobbes: Oog, I'm not sure I'm ready for this. Calvin: Ok, dupe! Hobbes and I are going out to play. You clean my room, and when you're done, I've got some homework you can do, too. What?! Forget it, bub! Find some other sucker to do your dirty work! Last one outside is a rotten egg! Hey! Come back here! Hobbes: He's a duplicate of you, all right. Calvin: What do you mean? This guy is a total jerk!