I feel sad after some films. Never feel down after them though. One thing that does make me feel down is watching a George Carlin standup
Not because he's dead just because of how much truth he speaks - it makes you think everything's ****

Just come across this thread and the existence of "Threads" which is quite surprising as I live in South Yorkshire myself and I like to see 'local' films. I am pretty much down in the dumps after reading about it on IMDB, never mind watching it!
Fail Safe.
Either version. Crushingly claustrophobic and bleak in its inevitable consequences.
Some films require you to use your imagination, whilst others just splurge it all over the screen. This is one of the former.
Watched Seven Pounds last night, which was extremely depressing.