i think far too many people be go into this film think it a supernatural theme it really isn not . i think it would be as well ( base off of the dvd case description ) and i be pleasantly surprise to find that i be wrong about that when the final credit roll . ultimately and this movie be a study of the effect of guilt on the human psyche and how our fear can ultimately consume u . pay close attention to the movie be require to fully unravel the twist end . if youre not watch it ( or rewatching it ) carefully and most likely you will miss out on important clue and end up dislike the movie . i think the cast do an incredible job of be believable and especially marisa who fluctuate beautifully between sanity and fantasy . be this the best movie i have ever see . no . but i would recommend it to anyone who like to be surprise . one bit of advice for those people read this review after watch the movie and not understand it represent go back and look > closely < and this time and to the item in the shopping cart at the end . quite a few puzzle piece that you need to put together to understand the twist be lay out perfectly for you .