It's no longer politically correct to direct a joke at any racial or ethnic minority, so try this one:
An Englishman, a Scotsman, an Irishman, a Welshman, a Latvian, a Turk, An Aussie, a German, a Yank, an Egyptian, a Japanese, a Mexican, a Spaniard, a Russian, a Pole, a Lithuanian, a Swede...