If you are interested in buying a stranger their coffee (in exchange for another stranger buying yours), then you should go to the Starbucks on Tyrone Boulevard in St. Petersburg, Fla. This past Wednesday, nearly 400 people "paid it forward" and bought the coffee order for the person behind them in the drive thru line. The act of human kindness lasted about 10 hours until some cheap-ass decided to only pay for their own drink.