Mike Tyson was not nominated for a Tony Award for his Broadway show "Undisputed Truth". But Iron Mike did produce a one-man show on Broadway. Therefore, he played a role in host Neil Patrick Harris' opener of the 2013 Tony Awards.
In the middle of the song, the former heavyweight champion strolled to the front of the stage wearing a white suit and stood next to Harris. He did a couple dance moves, pretended to try and bite Harris' ear and then chanted "Go Neil go!" along with the rest of the performers.
Watch the video above. Tyson makes his appearance at the 3:15 mark.