Calvin and Hobbes by Bill Watterson for March 10, 1990
Calvin: Hey Dad, can I take the gas can for the lawn mower out in the back yard? Dad: What on Earth for? It's 8:00 at night! Calvin: I want to pour gasoline in big letters on the lawn.....and set fire to it so airplanes can read it as they fly over! Dad: No, you can't do that! Don't be ridiculous! I don't even want to know what he intended to write.