My rules pretty much line up with every one else here but I have one more.
NO SINGING ALONG WITH THE MUSIC!
I will go Simon Cowell on your *** in a heart beat!
My car is not an American Idol audition.
People singing out of tune grates on my soul.
Back when I carpooled to work 99% of the people I worked with were tone deaf.
So, no singing in my car and a big nope to karaoke too.