I'm gonna have to think about this one because there are so many.
Most of the films I watch would probably fit into this category.
(which doesn't necessarily mean they're any good)
From the ones listed I love House (Hausu). Trippy, surreal, hilarious, and just plain one-of-a-kind craziness.
(Where else have you seen a piano eat people?)
The Host is one of the best monster movies of the last 10 years.
And in general some of the best stuff coming out these days is from South Korea.
Stunt Man is a classic. Lots of Oscar noms for that one.
Murder By Death is hilarious.
Just for starters I'll toss one out that I saw again recently:
Advise and Consent - A brilliant political drama by the great Preminger that's as relevant today as it was in 1962.
....but the world goes 'round