The Tenant (1976)

Trelkovsky is offered a small Paris apartment formerly occupied by a woman who threw herself out of the window. His neighbors are more difficult than most and he notices that people in the communal bathroom across the way often stand stock-still in there for long periods. By the time he finds a human tooth secreted in one of his walls, he's pretty much losing it.

It's a bizarre, but not unwatchable movie -- though the English dubbing tries its best to be offputting. The weirdest thing of all is that I never knew this film existed. Polanski is very good in the principal role and it's different enough that it seems logical for it to be well-known. As my sister said, "why isn't Polanski in drag one of the first image results when he's searched?" 

C+