Manos: The Hands of Fate. Seriously, just Google it. Even the title is fail, translated it's "Hands: The Hands of Fate."
Mystery Science Theater 3000 uses it as the benchmark for every movie they did since. You can watch it here: http://www.archive.org/details/ManosTheHandsofFate, you've been warned. I've seen it 4 times, two of those times were in a row, on a dare, to see if I could suffer through it. Not sure how i managed to keep my brain from packing it's bags and leaving.