As retold by Bruce Lowitt

The member of the Orthodox synagogue approaches his rabbi and tells him, "I have just bought a Bentley. Would you mind saying a brucha over it?"

He asks, "What's a Bentley?" and, when told, says, "Absolutely not."

So the man goes to the Conservative rabbi and makes the same request.

He asks, "What's a Bentley?" and refuses when he is told what it is.

So the man goes to the Reform rabbi and makes the same request.

He asks "What's a brucha?"