The row of LEDs under the main headlights on any new Audi. They always seem to be lit, no matter how bright the sun is on any particular day. They serve no purpose other than to alert other road users to the fact that the driver of the Audi owns an Audi, and that their Audi goes faster than your car. Unless you own a Porsche.
"Oh look, an Audi driver has driven right up behind me with his Wanker Lanterns on."