Here's what Frank McGrath's old training partner told me....
McGrath was bouncing at a club, looked over and saw his boss (bar manager) all over his girlfriend (at the time) and shit. Frank went over, picked the guy up by his collar and threw him down a flight of stairs. Needless to say, he didn't work there after that.
Also, just remembered another one, McGrath's girl (at the time) phoned him one night cause there were a group of guys hitting on her outside a bar and calling Frank a pussy. Frank was 3 weeks out from nationals and went to where they were with a tank top on at 260, shredded to pieces. The guys saw him coming and took off.