You are right, Alm..
Some venues that have fluro lighting can cause some dramas, saw this (or should I say heard?) happen a lot in Canberra when I was chief Roadie, drinks meister, Bass and Guitar tech for a mates band.
A lot of the older pubs would cause some major dramas, where as the newer ones not so much.
The worst one was an outdoor gig in Civic, that place had so much EMF is was near impossible for the sound guys to get the setups right...