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2:42
When sitcom star Tim Allen first appeared on Johnny Carson's "Tonight Show," he bombed.
1:23
Howie Mandel thought he was auditioning for a sitcom.
1:04
George Clooney used his popularity to speak out against discrimination.
1:48
Noah Wyle discusses the character growth of Dr. John Carter.
1:26
"Home Improvement" star Tim Allen wasn't planning on leaving standup for television.
0:43
Jerry Seinfeld describes the challenging act of "getting a laugh."
