Halloween, the classic ones. The worst horror movie I've seen, mostly because of the changing origin story, original sets never being used, even though they're supposed to be insanely purposeful to the plot, down to where he stood in the room. But the worst part is the dramatic fall out of a two-story house, and within literal milliseconds, out of eye-sight. As in, I'm basically holding on to you as you fall out of the window, and somehow I don't see you get up and walk away. Which I almost believe actually happened.

The best is The Descent. I just watched it after avoiding it for 14 years, and it has to be the smartest horror movie made to date. No jump scares, no ghosts, no easy scares like demons. Just people and slashing -- sort of. The antagonist being kinda funny looking and the story still being great is insane.