Don Zimmer was in a fight when he was a coach with the Yankees where he did a big fat old man belly flop when he swung on a guy and missed. Hilarious.
Is that the same fight where Zim was body-slammed by Pedro Martinez?
I guess you could call it that, if you wanted to be overly dramatic and a homer. Watch the fight again. Zimmer cocks his fist to take a swing at Pedro, Pedro steps aside and uses the fat guy's momentum to knock him down. Mostly a failed swing and miss. And since he was, you know, in the act of trying to punch a guy in the face (and Zimmer came off the bench, wasn't involved in the on-field problem), he had it coming, and more. I would have punched him, Pedro was nice to just knock him down.
http://www.youtube.com/watch?v=Jb8Tpt6lEjg
As for favorite fights in that vein, Varitek/A-Rod has gotta be mentioned, as it was the momentum that took the Sox into the 2004 World Series.
For classics, there's the guy that rushed Nolan Ryan. Ryan just puts the guy in a headlock, takes off his glove, and uses his non-pitching hand to beat the crap out of his face.
My favorite is, of course, Izzy Alcantara. He realized that when rushing the mound, the biggest problem is that the catcher often prevents you from getting there, or kicks your ass once you do. Izzy beat the system by drop-kicking the catcher BEFORE charging the mound!
http://www.youtube.com/watch?v=S2uGROwr-rY