Sis Boom Bah

Johnny Carson's "Carnac the Magnificent" segment had him predict the answer to a prompt in an envelope. In this one, he predicts "Sis Boom Bah!" as the answer. He then opens the envelope to read the prompt: "Describe the sound made when a sheep explodes." The entire studio is then paralyzed with laughter for over a minute before he can continue the segment.

Example of:
Baa-Bomb