Not a joke but, this is strange and interesting.
This is a car advertisement from Great Britain.
When they finished filming the ad, the film
editor noticed something moving along the side of the car,
like a ghostly white mist.
They found out that a person had been killed a year earlier
in that exact same spot. The ad was never put on TV because
of the unexplained ghostly phenomenon.
Watch the front end of the car as it clears the trees in the
middle of the screen and you'll see the white mist crossing
in front of the car then following it along the road.
http://www.gdiu.ws/cgi-bin/ghostly/video.cgi?idx=185