A good friend of mine (we'll call him G) worked at an auto body shop. An older client came in and was bitching about how his brand new Mazda (IIRC) kept freaking out when he changed lanes, and asked G if he could disable the lane departure warnings. G showed him how and said, BTW, these are supposed to be a backup for if you fall asleep - they don't go off if you use your blinker.

Dude bro politely asked G to turn the lane departure warning back on.