For me it would have to be this horrible movie we rented nearly two years ago titled "Flashback". That wasn't even a B movie. Total stinker. (but it did have some incredible foot scenes and one or two tickle scenes in it, so that at least partially made up for it being total unwatchable crap)
Another one that would rank up there would be "Slumber Party Massacre Part 2". I love slasher flicks, but that one was just plain retarded, with some real creepy weirdo guitar playing slasher that had some kind of revolving pointing drill at the end of the guitar arm he's kill people with. We're talking really sad stuff here. 🙄
Then again, who could forget "Rabid Grannies".... 😀
Mimi