I've never watched it.
I have, however, just seen the gag reel the filmmakers attached to the credits—I'm waiting for Apollo13 to start—and it is a disquieting testament to just how terrible movies can be. Not even the crew thought it was funny. People fucking up, walking out of unexpected places, just generally doing gag reel stuff, and crickets. Not a peep.
"Will you people please just get the lines right so we can get away from this entirely convincing argument for the destruction of Hollywood that were being paid to call a MOVIE," their silence seems to be telling us.