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One of the most unusual and impressive appearances in The Hangover is that of former boxer Mike Tyson.

However, the athlete did not remember being involved in the film before it was released, as he admitted to being drunk and under the influence of drugs when the production was filmed.

Tyson talked about this in a conversation with Tony Robbins, writer and motivational speaker (via Mirror).

"I met the guys [Zach Galifianakis, Ed Helms and Bradley Cooper] at a club, they were in the VIP section and I said, 'This is where I normally sit, no one is usually here,'" he commented.