Calvin and Hobbes by Bill Watterson for December 17, 1985
Dad: Calvin! What's all this noise?! You're supposed to be asleep! Calvin: Monsters under the bed, Dad! I was whacking one with my baseball bat! Dad: Goodness Calvin, it's just your stuffed tiger! You should put away your toys! Calvin: Sorry, ol' buddy. Good thing I missed occasionally, huh? Hobbes: Yeah. Let me see your bat a minute.