Drop what you're doing and check out these two fantastic videos, shared courtesy of Dash Shaw.
These two clips make up a 13 minutes adaptation of Yoshiharu Tsuge's landmark manga story, ねじ式 (Nejishiki, "Screw-Style"). Screw-Style appeared in English in The Comics Journal #250, (and some of his shorts were in Raw) but the majority of Tsuge's work is still yet to be published for English audiences. I'm not sure on the year of this animation, but the story was originally published in Garo's June 1968 issue. Please enjoy!
Many thanks for the links, Dash!