Calvin and Hobbes by Bill Watterson for January 12, 1990
Mom: Where are you going? Did you clean your room like I asked you to? Calvin: I'm going outside. Calvin can clean his own room. Mom: I don't want any nonsense, Calvin. Go upstairs. Calvin: Calvin? I'm not Calvin. I'm his duplicate. Calvin's in his room. Mom: What did I just say? No nonsense, Calvin! Go clean your room. Calvin: Boy, your are a crabby lady! Who are you? Calvin's cruel governess? Mom: That does it.