Are you auditioning for a play you haven't read? 

I would have to say nearly the same thing for audiences!  At least read the background info on performaces before you go see a show you're unfamiliar with. 

I attended a production of "Chorus Line" at a Philharmonic Center for the Arts (NOT cheap tickets ... wealthy patrons ... the whole she-bang) and half the audience left at intermission because of "Tits and A--".  Good for me, though, as I moved into better seats for the second half of the performance!