So I have a theory... [possible spoilers]
Watching too many Shutter Island, Secret Window, Beautiful Mind and what not, I was hoping for a gory twist like Jolie's character is Ryder's alter ego in some way and she was responsible for her death at the end. Also the beginning scene of her looking back of the taxi to see if she is hallucinating, or even the Twilight Zone like touch of the taxicab driveralso gave some suspicion but it was a 'normal movie'. Also I don't think I was reading too much between the lines when Ryder's character shouted out "You are dead!"
My father was a drinker and a fiend