[tic]

I would agree that the term horror implies an emotion; but what that particular emotion is hard to define. It may be fear, disgust or be disturbing or perhaps worse make the audience think, e.g. I spit in your grave would propbably fit in the disturbing area, but the reaction from the viewer to the vengeance of the victim against her violators, could also classed as disturbing, therefore in that sense is a definite horror film.

I think also horror films with a possibility of fact or reality could fill the above categories, e.g Wolf Creek, and i would suggest those type of films are perhaps the most scary, simply because they could happen in real life.