Douchbages who drive with their seat back almost all the way and do the gasta lean.
People who put DIY HID kits in a single bulb dual beam reflector housings. All it does is act as a high beam. But they say," Aww yeah with hid it lights up everything." But they are just blinding everyone and especially if they are following right behind you.
People who drive at night without headlights on.
Cars with a burned out headlight.
Fart can mufflers.
Semi trucks going too slow in the passing lane.