I was working for a system control's company many years ago and we were visiting a gas holder station in London to measure up. Next to the Gas holder station (those great big round thingy's) was a new car storage place prior to shipping to dealers - the night before we got there a load of kids had broken in and played banger racing with the cars (they leave the key's in them) - carnage everywhere. The scariest thing was they had crashed one inches away from the main gas feed pipe - a seriously big pipe feeding half of London !!!!