Mike Tyson broke Steve-O's nose at the end of the Sheen Roast. LOL. Fail.
http://gawker.com/5841970/mike-tyson...-central-roast
As for the Charlie Sheen roast itself, it was hugely inappropriate which is what roasts are supposed to be. As Whoopi Goldberg explained on The View, roasts were originally not aired and didn't include "outsiders" who could share opinions of the inappropriate jokes.