A very frightening dream of a massacre?

I had a dream that I was in this building where people were being forced to slide down a chute that dropped them into a room where a madman would dismember their bodies with a chainsaw. It was very similar to something that would happen in a movie rendition of the Texas Chainsaw Massacre. At the end of the dream, I slid down the chute myself to experience my demise. This dream just really bothers me and any explanation would help me out a lot.