John Lithgow & William Shatner Pulled Epic Prank On '3rd Rock' Set

"Shatner considered it the best acting he had ever done!" John Lithgow is a notorious prankster, and he shares the hilarious story of his all-time favorite prank, when he and William Shatner exploded into a fake fight during a "3rd Rock from the Sun" taping on April Fools Day. John also reacts to his "3rd Rock" co-star Joseph Gordon-Levitt's story of how his mom used a bag of live crickets to get revenge on John. Tune in today for more fun with John Lithgow.