Try being in Canada, the tour selling out a venue for the second day in a row, and bailing out of day number 2 because the headliner isn't happy with the sound system. Now that is a bummer.
Who bails for crappy PA? Seriously, its gonna happen and you have an engagement to the people paying money to see you. Especially when the show is sold out...
I also am wagering that, at least once, they get completely lost about a block from the venue and end up two states away at the time at which they're supposed to be going on.