As it's no longer politically correct to direct a joke at any racial or ethnic minority, try this one:-
An Englishman, a Scotsman, an Irishman, a Welshman, a Ghurkha, a Latvian, a Turk, an Aussie, a German, a Yank, an Egyptian, a Jap, a Pakistani, a Mexican, a Spaniard, a Russian, a Pole, a...