It's even better when you don't realize there are two antagonists. Going back and watching the movie again with that knowledge just makes your heart sink all the faster when he asks, "What door am I at?"

First time watching, you're like, "OK, she's got a 50/50 chance of getting it right." Second and subsequent times though, you realize just how completely screwed she is because there IS no right answer. One of them was at the front door, one of them was on the back patio, and the only thing that kept her alive just those couple of extra minutes was slipping out the window.

I love this movie. :)