A Texan, a Russian, and a New Yorker...

A Texan, a Russian, and a New Yorker go into a restaurant in London. "Excuse me, but if you wanted the steak you might not get one as there is a shortage due to the mad cow disease", says the waiter.

The Texan says, "What's a shortage?"

The Russian says, "What's a steak?"

The New Yorker says, "What's excuse me?".