Calvin and Hobbes by Bill Watterson for May 30, 1990
Calvin: You know how people look at modern art and always say, "my 6-year-old kid could do that!"? Well, that gave me this great idea! I've decided to become a forger and get rich passing off fake paintings to museums! A lot of paintings sell for tens of millions of dollars now, so I make a pretty good hourly rate. Hobbes: You should probably scratch out the copyright date on the cartoon stationery. Calvin: Ooh yeah, glad you caught that!