The Barnstable County Fair Opens Saturday! One of my favorite nights to be there is when they hold the classic American demolition derby! Never been to one? What are you waiting for? Everybody like cars and destruction! In a controlled enviroment of course and as long as its not your car! A Demolition derby is a motor sport usually presented at county fairs and festivals around the country. While rules vary from event to event, the typical demolition derby event consists of five or more drivers competing by deliberately ramming their vehicles into one another.The last driver whose vehicle is still operational is awarded the victory. Here's some video from years past!