I hope I'm not presuming too much on my friendship with Peg Britton if I lift this joke from her blog:

A businessman boarded a plane to find, sitting next to him, an elegant woman wearing the largest, most stunning diamond ring he had ever seen.

He asked her about it.

"This is the Klopman diamond," she said. "It is beautiful, but there is a terrible curse that goes with it."

"What's the curse?" the man asked.

"Mr. Klopman."