"The Grandmother".
Released 1970, it was the first film by David Lynch that was more than five minutes long.

www.youtube.com/watch?v=8VaI1v0CIlA&videos=ldsrQrbVCWg&playnext_from=TL&playnext=1

It's an acquired taste - Jack Nance (the star of "Eraserhead") compared it to "spending half an hour in the electric chair"
( The Mock TurtIe ™ --- Thinks you are a cunt, on, Sat 16 May 2009, 1:24, archived)