The House of the Devil (2009)
Chosen by me from as I saw it at Poundworld
A conceptually clever and well observed film (more than just a period piece it wants to be seen as though it was actually made in the early '80s), it's rather neat but lacking.
It has an incredibly slow build with very little, save a somewhat abrupt death scene happening in it's first hour. It achieve some tension out of the sense of impending doom (it is called house of the devil after all and those repeated references to a lunar eclipse have not gone unnoticed) but it's last ten minutes feel rushed and underwhelming.
Tom Noonan is splendid bringing an interesting mix of excitement and worry (there's the slightest hint that he's not fully on board with the plan) that plays to his oddball strengths and creates a genuinely weird character.