The below link is just one example of a death that has occurred due to this stupid activity, but there have been numerous others.  Car surfing, if not obvious, involves a person standing or laying on top of a moving vehichle being driven by someone else.  There are also numerous YouTube videos of this as well including some with the “surfers”, performing the act drunk.

http://www.nbcnews.com/news/us-news/police-say-car-surfing-blame-iowa-teens-death-n373866