Can you only speak the truth - no matter how silly? Then you'll know how Rod felt when his teacher asked about his science project - because he could only tell her the truth:

"Aliens ate my homework, Miss Maloney!"

Of course, nobody believes Rod, so nobody bothers to ask where the aliens came from. Just as well - because Rod is helping Madame Pong and the crazy crew of the Ferkel on a very secret mission...