i beep back at cars that beep at me.
i also sing at the top of my lungs whatever song is bumpin from the mercedes/audi/bmw/whateverelseishoodrichnowadays

though it was funny. i was bikin on broadway in brooklyn the other day. some land rover was blasting an R&B jam. i turned the corner, and some audi was blasting the same song just continuing. i thought it was cool to have iPods and **** hooked up to your stereo, not playing the radio. ahh, how the times are a changin..