All of Mike Tyson's knockouts
 

The knockout of Marvis Frazier(in the pink shorts) is one of the best I've ever seen. Tyson is so fluid in his punching it almost looks like he rehearsed it.

Undoubtedly the most powerful puncher of all time... including Marciano.

But, this is my favorite Tyson fight:
https://www.youtube.com/watch?v=Rv4ro4D16H0

When asked by a Japanese customs official how long he expected to be working in Japan, Ed Schuyler of the Associated Press replied, "Oh, about ninety seconds."

Not so fast my friend.

Left hook!

Tyson is the GOAT. With all respect to Ali, Tyson would have knocked him out easily in his prime.