Calvin and Hobbes by Bill Watterson for July 06, 1989
Calvin: Dad, how does a light bulb work? Dad: Magic. Calvin: Didn't you say that's how the vacuum cleaner works? Dad: Right. They're both magic. Calvin: You just don't know how they work. I'll bet. Dad: Fine. Don't believe your own father, who's been around a lot longer than you. Calvin: Look Mom, magic! Mom: That's not magic!