Steak Shortage

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?