Carnage: The Legend of Quiltface (entitled just Carnage Road in the credits though!) This movie was made on a video camera and I swear edited with windows movie maker.
Manos: Hands of Fate (picture is of Torgo)
Hellgate: The House that Screamed 2 (seriously, seriously retarded) One of the longest opening credit scenes ever, plus it seems to me that there is a lot of recycled material mostlikely from the House that Screamed
Dishonorable Mentions:
The Horse Whisperer
Attack of the Killer Leaches
The Screaming Skull
Silent Night, Deadly Night
Witchhouse 3
Camp Blood 2
The Jackhammer Massacre
And a bunch of horrible softcores, but I don't think those count do they?
Plan 9 From Outer Space- considered the worst movie ever made wasn't that bad in my opinion. I think Ed Wood had talent and vision to make campy b-movies in the 50s. Atleast they are watchable. (Quiltface and the House That Screamed 2 are two of the most unwatchable movies I've ever endured.)