Alien -- I still can't watch it unless I am in a very specific mood (I.E. to be scared). The pinnacle of "atmosphere" and tension-building -- nothing even happens for like 40 minutes, and there's no blood for about half the movie.

If Alien was an allegory for struggling by one's self with a disease (I.E. cancer), then Aliens was an allegory for an epidemic (I.E. aids) -- I love the way the director seems to build the tension, and then just turns it into an action movie.

Getting old school, the one with the giant concrete statue...can't remember the name, three syllables, something like Daikugin...maybe something with a Z...that one creeped me out as a kid.