Reminds me of a gig I had in a studio where the lead singer was a real jerk to everyone in the studio and to his band-mates, he kept berating everyone in the band, telling them to play better, and when it was his turn to record vocals, I pitch shifted his monitor a half note :-) Watching him squirm in the vocal-booth trying to hit a note was priceless.
I mean seeing how he has probably pissed off just about every theater kid living by now it's just deserts. Nobody is racing down from the booth with a lav for this guy.