I had a few completely sober idiots that Iād repeatedly tell off too.
One guy who loved to make a nuisance of himself in the last bar where i worked made a complaint to the council that our tables were too angular/square. They actually had to come and inspect them 
There was a another guy (father of a well known drummer) who used to pee in a bottle and come in and drink it at the bar and try to get other people to drink it under the guise of being apple juice or something. He also used to wear short shorts (heās about 75) and often his balls would hang out of them and I never quite knew if that was intentional or not.
Both rotters who got away with a lot purely because of being old.