Don't open your doors and drive...
I was at the Olympic marketing event yesterday and one of the staffers was backing up a 335i with the sport package. She was unbelted.
To see where she was going, she opened the driver's door. The car instantly went into park and made that gnashing sound expensive German cars make when several $1000 parts are stressed beyond their limits.
MY12 335i ZSL with a deep dive into the options list
ED: 2012-07-19; Arrived in Jersey City: 2012-08-23