I'll have to add Joe Frazier. I remember him jumping Ali during a Cosell interview. They wrestled around on the floor. It may have been staged, but I don't think so. By all accounts he went into the Manila fight in a rage.
Duran deserves a mention. look at his reaction when SRL lifted his hands at the end of a round in the first fight (or was it the end?I cant remember which)
Pick your Irish battler: John L. Ike Weir (always got into street scraps) Tom Sharkey(caused riots [see vs. Maher and other events]) Terry McGovern (remember the pre-fight trick Young Corbett used to beat him?) Billy Conn