This one comes from experience. My first roommate in college, the main inspiration behind the character Jay, loved to drive fast. I rode with him a few times. It was quite like a rollercoaster, only it felt much more dangerous. We swerved around corners and jettisoned in and out of parking spaces. He would laugh and make light conversation while I tightly gripped the seat cushion for stability.
Interestingly enough, he had never been in an auto accident. He had plenty of speeding tickets, but he was at least safe.
