Liver and Cheese.

A Border Patrol agent is on duty. He spots two Mexicans and stops

them. They show him their papers, but he thinks they are phony.

He tells them, Okay, I have a test for you. I want you to use the

words liver and cheese in a sentence.

So, the first guy says, I made a liver and cheese sandwich for

lunch.

The agent says, That was good, you can go. What about you? he asks

the second guy.

He says, Liver alone, cheese mine.