Hell yes, Manos is one of the most awful movies I've ever seen, but I still think that "GRIM" is a tad worse. Hard to imagine but true.
Anyone that thinks "Sixth Sense" or even "Howling 6" ( stop bashing it for Christ Sakes, looks like you haven't seen part 7! ) should really check "Grim" out. The only useful thing about this movie is that you can tape it and give it to your ex-girlfriend as a present ( I did that, after all, it had to be good for something to sit through 86 minutes of pain! )