Calvin and Hobbes by Bill Watterson for January 21, 1986
Calvin Mom, can I take up the floorboards in my room and make a secret passageway. Mom: Of course not, Calvin. Don't be rediculous. Calvin: Why can't I? Mom: Because you'd come right through the kitchen ceiling. I said don't do it. Calvin: Okay, okay... Calvin: How quietly do you think we can nail these back in?