The document describes an experience the author had in a taxi cab where another driver cut them off, almost causing an accident. The taxi driver remained friendly and waved to the other driver, explaining to the author his philosophy of "The Law of the Garbage Truck"- that some people are like garbage trucks, full of frustration and anger, and may dump their garbage on you. However, you shouldn't take it personally or spread the garbage, but instead just smile, wave and wish them well as you move on. Successful people don't let garbage trucks ruin their day.