Never seen a fight.
The gym I train at now is in a fairly s,all/close knit community, so if u fuck with someone, ur gonna see them and their mates all the time.
At my old gym, there was this kid fucking around for ages on the nautilous press machine thingy mabob and my short tempered mate asked him how many more sets he had. He said a few then proceeded to talk on his mobile so my mate arced up hard and he's in reasonable shape, not massive, but fairly muscular for his frame. To the kid's credit, he didn't back down but he would have been fucked up big time. My mate is a schitzo.