While working as a stand up comedian, Allen was arrested at 25 in an airport for possessing more than 650 grams of cocaine. He pleaded guilty to drug trafficking charges and received two years instead of life in prison for providing the names of other dealers.

The experience was so bad that he was forced to turn himself around. He told Esquire, "When I went to jail, reality hit so hard that it took my breath away, took my stance away, took my strength away. I was there buck naked, humiliated ... this is a metaphor. My ego had run off. Your ego is the biggest coward."

Allen became known to the public for his role on the sitcom "Home Improvement," which premiered in 1991.

(Source: Businessinsider)