what do rock stars do when they have to take a crap in the middle of a concert?

[Corleone]

Just shit your pants... what's the big deal?

[pissedandpierced]

I think the guy from Dillenger also did a shit on stage a Reading, threw it into the crowd then it came flying back to him.

Fergie pissed herself on stage once, then tried to cover it up by saying it was sweat. I would have just admitted that I pissed myself instead of having a really nasty sweaty fanny crotch picture plastered all over the press.

[Variable]

I would assume that they stop performing and go take a shit.  That just seems like the logical answer.  " hey guys, we're going to take a 10 min break. Go get some drinks and we'll be back to rock out!"  You know?  Just seems logical.