The problem with Audi is a flawed headlamp switch design, where you pull the knob out to activate the rear foglamps. Unfortunately, I guess its easy to accidently pull it out when you turn the knob, and a lot of people don't look at their warning lights.

Speaking of which, I can't believe how many BMWs I see driving around with various warning lights on their dash. Presumably these are non-car educated people, but I see them driving with TPMS lights, DSC, BRAKE, etc..... lit up, and I wonder........do they know that there's a serious malfunction!?