The Fourth Kind.

The Fourth Kind was fascinating. From a linguist's point of view, from a psychologist's point of view and from the point of view of someone who is interested in events classified as 'paranormal.'
I like when movies take the approach of not really showing the 'monster' and just implying that whatever it is is absolutely terrifying. That way, each individual audience goer can come up with the image that is most horrific to them, making the experience scary to each person. While I may imagine a more human type form to be most frightening, a companion might picture, say, the Cloverfield monster in that place.
I enjoy movies like this, though. Movies that are actually 'based on true events,' especially when the film is supposed to be somewhat scary. It takes the film out of that "this is just a movie" zone and into this "shit, this happened" zone, solidifying the expected feeling of terror, in a way.
This is the kind of movie that leaves me wanting to do research.