Scariest Horror Movie of 2000 on....?

I'm having a party, or like a big get together. Like 10 people, and my friends are trying to find a few really scary movies to watch. So what are some of the scariest movies from the year 2000 to the present. And for the record, the film can be extremely gory, but no unnecessarily gross scenes or the like. Just give me a list of like your top five....