It's 28 year old males with money and no sense of self-worth. There are regularly reports of people doing nothing but driving up and down a nice street downtown. Flooring it from red light to red light, dropping the clutch on every gear change. All. Day.
The completely unrelated question I would like to ask is "Why is it allowed to show your middle finger to random people on the street, but as soon as they're in a car, it's a crime?"