If you haven't seen this little twisted gem of revenge from Korea, check it out. I won't give to much away it's definatly one of those movies which just screws with you in the end. The story centers around Oh Dae-su a Seoul bussness man who after a drunken night out is abducted and locked away for fifteen years in a private prison(which oddly resembles a hotel room) with out any explination as to who and why till one day he's set free with a new suit, cell phone, and purpose: he has just five days to find the who and why of his imprisionment unfortunatly he finds out that the imprisonment wasn't the only torture he will endure.
Definatly, you spend the whole time thinking oh desu is the one who is exacting his revenge and then boom you find out that the "villian" was the one taking his revenge, by tricking oh desu into sleeping with his daughter that was truly a wtf moment. Something that ya rarely see in american films now a days