Coffee drinkers in suburban Kansas City are on a two-week binge of generosity. Ever since one person decided to buy a coffee for the person behind them in the drive-thru, the chain of "buying it forward" has continued. The caffeine addicts are even chipping in a few extra bucks, and the store owner wants to create a charitable fund out of the trend. How long will it continue? Will this new deal be coming to a Starbucks near you?