Why do I do this??

Probably to focus more on the road than the music.

The confusion and inability to concentrate with the music on is called discom-bebop-bulation.

The music acts as a barrier for your mind as it prevents you from focusing on the road and diverts your mind from seeing properly while looking for the address.

My husband makes fun of me for turning the volume down when I go to park the car.

did anyone notice that this guy has one black and one white hand

I always do it when a cop has someone pulled over!! No idea why! haha