We got stuck in it last year - when you get out of the lift, the next set of doors didn't open. It took a while for the CM's to realise, and so more and more people kept coming out of the lift and squashing forward - all accompanied by the scary Dracula voice every time the damn lift doors opened.
I have to say, it was funny at first, but then it got really scary because we were getting so squashed, and there just seemed to be no way out. Not the kind of scary we were looking for though!!