4. Old Boy/Oldeuboi (2003)
With the Spike Lee remake just around the corner, it is only fair to put this one in this list, because the original, as it seems for the trailer if going to far out pass the remake. Directed by Chan-Wook Park, this Korean film deals with the imprisonment of a man for 15 years and his struggle to find what has become of his life and especially his daughter when he is finally released. Whilst some may feel that the first half follows a run of the mill revenge plot, in which a man is desperate to understand why he has been held captive; it is the last act of the movie when everything comes together and the true horror of the events that have proceeded come to a shocking conclusion. A great twist for film fans, even with the gut wrenching reveal of who he has been dealing with. Certainly not one to watch your partner cuddled up on the sofa on a Sunday afternoon.