Kontroll (Hungarian) - Filmed completely in the Hungarian subway system. Awesome story and AMAZING soundtrack. I LOVE THIS MOVIE.
Old Boy (South Korea) - DO NOT get the 2013 American remake. Get the 2003 original. You might have to watch the ending a few times. It's quite deep. This is a close second to Kontroll.
Everything is Illuminated (US) - Heartbreaking and hilarious. No subtitles!
Legend of 1900 (US) - nice story and that scene of him playing the piano is one of my favorites.
Ferpect Crime (Spain) - Those Spaniards are hilarious.
Lock Stock and Two Smoking Barrels (UK) - Do yourself a favor and turn on the subtitles, The accents are so thick you can cut them with a chainsaw. The ending had me screaming at the screen.
Secuestro Express (Venezuela) - This movie has so many unexpected twists.
Reader Recommendations
10 Cloverfield Lane (US) - John Goodman steals the show here. And the ending is quite a twist! (Thanks Debra)