In elementary school the teachers showed us a bicycle safety video that really just freaked me right the hell out. It was so bad that I would have nightmares about it. For several years after that I would try to describe it to people and no one knew what I was talking about. This has haunted me for years. I felt that maybe I made it up in my dreams and it wasn't real. Today I was reading BoingBoing and LO AND BEHOLD someone posted an article about it WITH A LINK to the video.
Here is a picture and also the link incase you want to be creeped out.