I have neither the time nor the inclination to suggest why these should be watched. You'll just have to take my word for it
Dolls (Beat Takeshi)
The Texas Chain Saw Massacre (original, of course)
The Assassination of Richard Nixon
Dead Man's Shoes
Requiem for a Dream (those last two probably only the once!)
There are plenty more, of course, but I have errands to run and chores to be sorted...