I don't know which is the best but I'm hearing that Paranormal Activity will like scare you out of your pants.
Anything Friday 13th or Freddy is probably right up there. I don't have a particular favorite. If you want to scare anyone then set the atmosphere. Nice wide screen with surround sound and no lights.
Name: Viring
Comments: I'm looking for the best Halloween movies for this year, something current that isn't just all gore but has some mystery to it too.
Its kinda hard to recommend scary movies because everyone is different. Some people aren't moved by slashers but they do like something with thrills that make you jump because of a sudden sound or something. You could try Bereavement. Some hated it others liked it, you be the judge but don't hate me.