Evil Dead II with the laughing inanimate objects/the evil hand/the whole God Dethroned thing.

Of course for unintentional laughs, nothing beats and Ed Wood classic. I always feel guilty for laughing at those movies (and maybe it's because of Tim Burton's Biopic) because they seem so earnest.

And there was that one time Jeff and I watched Nosferatu and we just kept quoting Darby O'Gill.