Hm. Eraserhead, Clockwork Orange and the like aren't that strange when compared to experimental 90's movies. Mostly Oriental. That shit is so obscure you probably will never see one, but FUCK they're weird. And not only creepy in idea. It's full-blown creepy and filled with weird symbolism and subliminal messagery. It's all a story that connects without the use of words and it can smell your fear. Even if it's ment to be light-headed, it still feels like it wants to eat your face.
Want an example? This is probably the best one, even though it's a game.
The author's diseased mind also makes experimental movies to this day. They're pretty strange, but not so much as his previous work.