You are a passenger in a car being driven by a friend of yours. As the two of you are driving along, your friend receives a call on his cell phone, taking it out of his pocket to answer the call. What do you do? You have two choices; keep quiet and let your friend continue the phone conversation, or, say something immediately, like "Please pull over and stop the car while you complete your call." I'm betting very few of you would say anything at all. Driving is dangerous enough; some 33,000-40,000 people are killed and well over two million seriously injured every year in the US. By saying nothing to your friend, you have just tripled the risk of a crash for the two of you.