You should check out this car commerical from New Zealand. When they finished filming the ad, the people who made it noticed a ghostly white mist moving along the side of the car, and an eerie sound. You may need to turn the volume up, enough to hear it. The ad was never put on TV because of the unexplained ghostly phenomenon. About halfway, as the car goes past the trees, look and you will see the white mist crossing in front of the car then following it along the road. I don't take those things seriously, but it's interesting.