The Beeping Rock
S5, E23: A wild story told by an 11-year-old about his recent trip to the moon enthralls Eb and Lisa. Oliver believes none of it especially when the kid sells Lisa a moon rock for $14. But once the rock stars beeping under the moonlight (and when Arnold snorts at it) he suspects he's the subject of a practical joke. Oliver ships it off to NASA for their scientists to examine.
