Bullitt, best car chase ever!
Monsters (2010)
Very good movie. Its only time when it lets itself down that I can see is when it decides to show the creatures themselves, as ***** taught us it's always better to leave an element of ambiguity there when it comes to your creature.
Is that Thirst better than this Thirst? http://www.imdb.com/title/tt0762073/
As for me, Alien3, the most underrated movie of all time.
Paranormal Activity 2