Calvin and Hobbes by Bill Watterson for March 13, 1989
Calvin: Can you believe this? I've got to assemble my beanie porpeller and motor myself! What do they think I am, an engineer? Look, I've got to insert these wires and this plastic switch! I can't do this! Hobbes: Here. Let me try. Calvin: No! Get away! I'll do it! You'd probably goof it all up, or... Oh no! Hobbes: See? Insult a tiger and you get bad luck! Every time!