The story I heard may be only an urban legend, but if so it's a delicious one. Seems that a small Irish dance troupe was performing in Germany before WWII. Before one performance, the manager came in and instisted that they give the "Sieg heil" salute three times before they began their performance, because Goebbels was going to be in the audience. They didn't want to, but the manager threatened to cancel the gig if they didn't, so they finally agreed, but requested to give greeting in Irish because their German wasn't good, to which he agreed. So they came out and faced Herr G., raised their arms in the salute three times, and shouted: Póg mo thón! Póg mo thón! Póg mo thón!

Stephen