The Evil Dead series and Drag Me to Hell. Can't go wrong with Sam Raimi!
The humor in Raimi movies are intentional, though. Not sure if this makes a difference for you, but whatever.
All you really need to do is go to your local video store and go to the horror section. It is harder to find movies that don't fit your description than it is to find what you want. Some movies are just so bad that they are unwatchable though (such has Fear of Clowns, and The Mangler Reborn, which you should avoid like the plague.) But you can't go wrong with one of the later Nightmare on Elm Street movies for "so bad it's hilarious" quality. Especially the 6th one.