A friend of mine went for a ride on the back of a bike and only put on a dome helmet which was probably the driver helmet. She said she felt the back of the bike fish tailing around 30mph and the bike went down. She is ok and getting better and she said she will never get on a bike again. From look at the photos her hair looks ok but her face, that another story. I told her to post one of her photos on ride2die.com. When she was on sport bike she always had a full helmet on but a Harley I guess it was not cool.