Tyson didn't know he agreed to 'The Hangover' due to drinking, drugs

Mike Tyson made a memorable cameo in the 2009 comedy "The Hangover," but the former heavyweight champion admits he has no memory of landing the role.

In a recent interview with author and life coach Tony Robbins, Tyson said he found out he was in the movie after meeting Zach Galifianakis and another co-star the night before shooting began.

"I met the guys in a club. They were in the VIP section and I said, 'This is where I normally sit, nobody's normally here,'" Tyson recalled. "So I went in there, I'm checking these guys to see what they're doing in my section. It was Zach, and the other guy, and he said, 'We're going to be in a movie with you.' I said, 'Yeah? When?' He said, 'Tomorrow.'"

"And I didn't know 'cause I was drinking and smoking back then, doing drugs so I didn't know I was involved in the movie. So eventually I had to go, we did the movie and it was a success."

Tyson revealed in a 2012 interview that he was "was a pig, high on cocaine" while filming "The Hangover" and that his co-stars must've known he was on drugs. He also made an appearance in the film's sequel, "The Hangover Part II," which was released in 2011.