Taken (2002)

Six friends come together to play "The Game" as a celebration of Nick's birthday. After a few rounds of they get separated while following a black van. Three stop in an alley so that Nick can relieve. His friends are forced into the lost black van by two druges. The other car of friends are informed by the kidnappers that if they want to see them again they have to do exactly what they say. It is revealed that the kidnappers are a modern day Jack the Ripper duo, stalking the streets, picking up prostitutes whom they murder and mutilate. These killer/kidnappers alarmed for being followed, frame these guys. It is the mission of the remaining friends to dispose of the body to retrieve their friends. The characters realize as the night goes on that they are trapped in a nightmare from which there is no escape? The cryptically calculated ending will finish off the audience's mental roller-coaster ride bringing the movie full circle.