It's people like this that gave birth to the term "quadtarded"
[ame=http://www.youtube.com/watch?v=ab33Q7Wtyv4&NR=1]YouTube - Quadtarded![/ame]
Then there are people on bikes like this.
[ame=http://www.youtube.com/watch?v=swyuHQvoyV0]YouTube - Stupid Dirt Bike Crash[/ame]