Calvin and Hobbes by Bill Watterson for December 14, 1989
Calvin: Look Hobbes, no one say us fighting, right! This can be our little secret, ok? Santa doesn't have to know about this, right? Hobbes: Maybe he does and maybe he doesn't. Calvin: Ok, ok, I'll even apologize! I'm sorry. How's that? See, it's ok to fight just a little bit if you say you're sorry afterward. Hobbes: You bit and kicked. Calvin: I said I was sorry! What more do you want?! Hobbes: You could let me read all your comic books. Calvin: Over my dead body! Hobbes: "Dear Santa, know what Calvin did today?"
This is blackmail!