Boxing has got to be rough on one’s brain. Getting hit in the head repeatedly for many years surely couldn’t make anyone smarter. Fortunately Mike Tyson didn’t have that to worry about, because he apparently didn’t have any brains to start with.

This video highlights some of the most memorable things he’s said over the years. Some are extremely dumb, while others are just shocking. But through it all, one thing is clear: Tyson has never played with a full deck.

Not being a boxing fan, I never paid much attention to Mike Tyson until his in-ring ear biting incident. Then I wondered what kind of person would do something like that. I think this video answers that question pretty well.