You know exactly what I'm talking about. Those guys who operate the super futuristic sports bikes that fly down the highway, weaving in and out of traffic.
I would say they are suicidal. They are just waiting for someone to change lanes and not realize they are going 20-30mph over the speed limit.
Another thing that drives me crazy are the people who bike without a helmet. I'm sure you really want your brains to paint the pavement. I'd rather not be witness to it.