Dubliner Shane Gaffney was visiting New York City. It was about 4:00 AM and he hailed a taxi cab. John McDonagh, an Irish American, was at the wheel, according to the Association of Mature American Citizens [AMAC]. Gaffney didn’t have enough money for his fare and so he gave McDonagh an IOU, promising two pints of Guinness at his parents’ pub if and when the taxi driver might visit Ireland. It…