Eating Out in London

A Texan, a Russian, and a guy from New Jersey are all in a restaurant in London.
When the waiter arrived at the table he said, "Excuse me, but due to our "Mad Cow" disease here in England, if you order the steak, you might not get one, as there is a shortage".

To which the Texan replied, "What's a shortage?"
...and the Russian replied, "What's a steak?"
...and the guy from New Jersey said, "What's "Excuse Me?"