Calvin and Hobbes by Bill Watterson for January 16, 1990
Hobbes: Mom said she sent me upstairs a minute ago! That must've been my duplicate! Hobbes: What a mess this is turning out to be! Calvin: You said it! He gets in trouble, but I'm the one who gets blamed! We'd better straighten him... Calvin/Hobbes: AAUGH! Hobbes: Your duplicator is a big success. Calvin: Oh no! Calvin 2: Are you kidding? It burned out after the fifth one of us!