I borrowed this one from the library, and I think Patrick (central character played by Hewlett) is "certifiable." He needs things to be in a particular order — the best part is when he separates all the Froot Loops by into bowls by color. He is also quite worried that Bad Things Are Happening, and in the end bad things don't happen, and he's not cured.

This one walks the line between real life and fiction: Gray Gardens documents a mother-daughter pair whose need to hang on to each other and their thoroughly decaying house is both an art form and an ongoing self-harm. The mother-daughter play themselves, and it was a pioneer in "artistic documentary." A fictionalized version played on HBO in 2009.