More than likely, he'd seen the latest Fast and Furious flick. Poseurs tend to get more aggressive after seeing their favorite stars in CGI chase scenes. In fact, I'd wager the accident rate climbs in the next few months. Silly kids. Real cars can't do that kind of stuff. It would be safer trying to bench press your car rather than jump it over a bridge
I'm in no way belittling the movie (actually, it was entertaining). I just find it incredible how little respect some people have for simple physics.
It's been said that there is no better teacher than experience. Some folks just need to get bitten to move ahead. Hopefully it worked for these guys.