Guinea Pig 6: Devil Woman Doctor

Za ginipiggu 6: Peter no akuma no joi-san (1990) is the story about a female doctor who is a transvestite, played by real-life Japanese transvestite Shinnosuke Ikehata. The film takes the form of several 'sketches' in which she treats her patients (often mutilating or killing them in the process). This episode shifted the tone of the series from graphic horror to extremely violent slapstick comedy.

Not only weird, but also pretty stupid...

Hausu (1977)

Funky Forest beats ANYTHING.

Spiral was the weirdest I've ever seen. I will have to give some of the movies listed in thread a go, sometime.

The easy answer, and one of the weirdest movies I've ever seen.

http://severed-cinema.com/images/mno...ine-poster.jpg

I've seen my fair share of weird Asian horror, but one of the most bizarre ones was probably Ekusute (Exte: Hair Extensions)
http://static9.opensubtitles.org/gfx.../4/0904049.jpg

Tetsuo. It was a very bad idea to watch it before sleeping.