Trail of the Screaming Forehead...it's one of those horror movies that so bad (on purpose in this case) that it's absolutely hilarious.
Between the awful special effects and the bad acting it's so ridiculously bad that it made me laugh the whole time I was watching it.
...I love movies like that actually, they're not great for watching more than once or twice but they make it worth the hour or two spent watching them.
Ticked-Off Trannies with Knives was pretty good too actually, though it wasn't scary either.
Fearnet on demand tends to have at least one or two movies along those lines all the time. xD