Mike Tyson, the same man who once literally gnashed off a chunk of another human being's ear, has begun showing his light hearted side. But this?

Iron Mike took an appearance on a Brazilian television show over the top by serenading the South American nation with Girl From Ipanema while rocking a white suit and a panama.

Tyson, once the youngest world heavyweight champion ever, deftly (or disturbingly) ran through the song with a flourish. Just check out how he mangles the Portuguese portions. (Por casa do amor becomes Pour causa dormor).

Could Iron Mike finally be softening up?

The performance comes on the heels of a show-stealing performance in The Hangover.

Of course, Mike is trying to overcome a long and checkered history in the American spotlight.