I actually liked The Mangler. Ever see Mangler 2? I thought the first one was a ridiculous idea executed as well as it could be. It's funny though, because it is one of those things that you have to practically walk into to get killed by it and even people who know what it is manage to get caught up.
Anyway, my vote goes to a flick you have probably never seen, DARK ROSE: FEEDIN' & BREEDIN'. The director lives here in FL and got a "good sport award" from the local paper for admiting it was one of the worst hundred movies ever made.
So the acting is bad and they only had lights on some of the days they shot, does that make it a bad movie?
You can read about it at
www.geocities.com/hocfocprod/darkrose.htm (notice it is a free website)