Don't pack your banana next to your underwear, 'cause if the banana gets squeezed while riding to the office, you'll have banana juice on you undies, and you aren't going to wanna wear them then. True story.

Real rule - defensive driving/riding. I spent a few years working for UPS and received commercial drivers training from UPS. The basic idea, always expect the other person to do something stupid/dangerous - so be prepared to avoid them.