It had a surprise ending. I am not a fan of the horror genre. The only horror movies that I have liked are The Exorcist, The Omen, Psycho and the Scream trilogy.

As for the Mist, it's not bad. And coming from a non-horror-fan like me, that's a big compliment. As for the surprise ending I had a mixed feeling. I did not like the way it ended - but I liked it because of the element of surprise. I never saw it coming.

Somebody mentioned IDENTITY. I don't think it can be categorized as a horror movie. It's a psychological thriller.