Something similar happened to me once, me and my buddies were playing at our local weekend course when a couple of middle aged gents playing behind us just went up and jump our 4 some without asking . I would have let them go for that but this two hacks drove up to our balls who are sitting nice and pretty in the middle of the fairway and started picking it up . Obviously we started hallering at them and they pretended they did'nt see us, so one of my buddy started to turn real read and drove up to this two guys to confront them for thier action , would you guys believe that one of them was caught red handed by my buddy trying to erase the mark my buddy have on his ball. Im like this cant be serious I never have anyone or anybody I know does something so trashy like that. Anyway my buddy was so mad he took one of the guys club and threw it off the lake , my buddy is about 6'3" 240 lbs ,in fairness to him I've know the guy forever and thats the only time I remember him getting mad as he did that day , I even played football with this guy in college and he never got in any altrecation ever. On the next hole one of the guys came up to us and apologized , he said his buddy has a little too much to drink , we said whatever. Now everytime we would play this golf course and we come up in the 11th hole lake we'd all have a laugh and trying to figure out how to retrieve that guys putter which my buddy said was one of those Betinardi's , ahh maybe in the middle of summer the lake would dry up again and we can pick up my buddy's price "the putter" .