Ghost Stories

One day on our way to Tuscan, Arizona we were driving and we hear knock knock knock on the window behing me which happened to be behind the passenger seat. We rewind the tape we were listening to and no knocking. I was thinking,"This is wierd." We pull over at a rest area and talk to the people in the other car traveling with us. One of the people in the other car said it was probably a Spirit Knocker.She said that she too had had wierd sounds, but hers were continual clunks of hitting thinks that were not there. I suggested rocks but I then remembered there were no rocks on that desert road. She thought she was hitting Spirits and that is what we stuck to. If you have ghost stories post them on this site!