Calvin and Hobbes by Bill Watterson for January 20, 1988
Calvin: Uncle Max, look! I'll show you a magic disappearing trick! Ok, first I'll need an ordinary twenty-dollar bill. Max: How about if I lend you a nickel instead? Calvin: No, it works much better with a twenty. ...Or a fifty if you have one. Max: I take it you think your ol' Uncle Max is a low-watt bulb. Calvin: Why, did Dad tell you how this works?