My favorite had to be a Geo Metro with what looked like a 6ft spoiler.

It was late late at night, we were both sitting at a redlight. He came up next to me with my windows down and started revving his engine. I didn't want to race him, so instead I turned of TC. Stared at him and proceeded to do a burnout, with a nice smoke cloud. His jaw dropped and then he hung his head... Then when the light turned green I just rolled out and mosey'd on my way.