If by a "Prom", you mean an end-of-term dance for pupils, then I've played one or two of those - for very, very well-off, "posh" teenagers.

They usually go OK, but there was one occasion, towards the end of the evening, when 3 or 4 very drunk kids came up on to the stage and made for the instruments, obviously intending to have a go. As if by magic, a couple of us appeared and held them gently by the arms, whispering quietly in their ears that, should one finger of theirs touch any of the instruments - however fleetingly - they would find their trousers round their ankles and their ties used as gags while we escorted them off the stage. That worked...

One of the teachers had the grace to apologise for them afterwards.