Motorcycles. Some riders are smart. Some riders are stupid. The latter category has shades of stupidity, right? Take for example the DB's who weave in and out of traffic, taking (what I would consider) unnecessary risks and putting themselves in danger.

This guy took it to the proverbial next level.  Popping a wheelie.  Right in the rear end of a police car. (I especially enjoy the frames where you see the cop get out and tackle the guy...)