Undisputed Truth by Mike Tyson with Larry Sloman:
That was the day that I turned into Iron Mike; I became that guy 100 percent. Even though I had been winning almost every one of my fights in an exciting fashion, I wasn’t completely emotionally invested in being the savage that Cus wanted me to be. After that talk about me being too small, I became that savage. I even began to fantasize that if I actually killed someone inside the ring, it would certainly intimidate everyone. Cus wanted an antisocial champion, so I drew on the bad guys from the movies, guys like Jack Palance and Richard Widmark. I immersed myself in the role of the arrogant sociopath.