Whats the biggest disagreement you have with people when considering a movie to be horror or not?

We all know each of us have our own limiits as to what counts as horror. Many people can go too far and sometimes we can expand on our own horizons, especially if you watch horror for the vast mojority of your time.

I'm the kind of guy that considers a lot of movies that most people don't, but the limit for me was when someone on youtube had A Clockwork Orange in their horror collection. I just can't see any horror in that.

So what about you?