Movie Stills Quiz

Via gnomic_noodler:

1. pick 20 films you love/thoroughly enjoyed.
2. find screen captures (stills) for each film, preferably from scenes you like.
3. post the pictures with the rules; let your readers guess from what movie each still is from. (readers, no cheating. no google, no looking at livejournal interests or looking at the file names.) basically, do not cheat.

I will screen comments so everyone has an equal chance.

( Lots of images behind the cut )