Before you blow your horn, have you considered the steering wheel?
I'm a mellow guy by nature, and driving is no exception, so it's always fascinated me why so many people act like crazed lunatics behind the wheel.
As a Mellow Driver, I tend to drive in the slower lanes, but I see aggressive drivers every day go nuts flashing their lights and honking their horns whenever the driver in front of them isn't going 80+ miles per hour. When you see their faces, they look like they're about to blow a gasket.
What amazes me most is that they continue to flash and honk for miles, instead of simply grabbing their own steering wheel (yes, all cars have them), and driving around the slower driver. Isn't that easier?