Dublin, Treblin

An Englishman arrives at Dublin station to catch the 11.17 to London. He goes to his platform, looks at the time, then looks for the station master. "You have three clocks on three platforms," the Englishman says to the station master, "but they all tell different times." The station master gives him a look. "Now, sir," he says to the Englishman, "what would be the point of having three clocks if they all told the same time?"