The Exterminating Angel--94 pts.
I deduct a point because I've never like the solution to the dinner-goers problem. However if you'd like a base course in Bunuel's surrealistic movies, this is second only to his and Salvador Dali's collaborative film: Un Chien Andalou. But Bunuel doesn't need the shock of that film's opening to jolt the viewer. From the severed hand, a bear and three sheep in a house, to the general dilemma of the party goers when you and them realize there's a problem; you're constantly being yanked in unexpected directions.
An essential film available streaming, ad free, on Hulu.