Calvin and Hobbes by Bill Watterson for March 29, 1991
Calvin: Don't tell me my duplicate is writing Susie mash notes!! Hobbes: You little charmer, you! Calvin: I'm the dictator-for-life of the Get Rid of Slimy Girls club! My reputation! My honor! My principles! We've got to stop him! Oh no! He's not in my room! He must be on his way to Susie's house! Hobbes: You're probably getting smooches right now! Big wet ones, I bet! Susie Derkins: More sarcasm?! You come here again and I'll clobber you, Calvin.