The original ideas of this thread are believable...
-more idle time means more gas burnt, more gas purchased means more tax revenue, more revenue means more money for city hall to waste
-more out of sync lights mean more people speeding to make the green hence more speeding tickets, etc...
As for the secondary dicussion in this thread: Do to others as you would have them do to you....which in my book means NO THROWING THINGS.....bad idea, even in jest..