A Texan, A Russian and a New Yorker.

A Texan, a Russian and a New Yorker go to a restaurant in London. The waiter tells them, "Excuse me -- if you were going to order the steak, I'm afraid there's a shortage due to the mad cow disease." The Texan says, "What's a shortage?" The Russian says, "What's a steak?" The New Yorker says, "What's 'excuse me'?"