Katzelmacher (movie, 1969)

In this unflinching German drama by Rainer Werner Fassbinder, a group of young slackers, including the couple Erich and Marie, spend most of their time hanging out in front of a Munich apartment building. When a Greek immigrant named Jorgos, moves in, however, their aimless lives are shaken up. Soon new tensions arise both within the group and with Jorgos, particularly when Marie threatens to leave Erich for the outsider.