They were over the ocean when the pilot announced to get ready the plane was going down into the water. Immediately Mrs. Cohen opened a little bag full of jewels, and started putting it all on. 

A black women sitting next to Mrs. Cohen said "What are you doing at a time like this?"

Mrs. Cohen said "If we survive, and we are floating in the water, when they come to pick us up they'll see all the jewelry on me, they'll think I'm important and will pull me out first."

With that the black women started undressing until she was buck naked.

"What are you doing?" asked Mrs. Cohen

"Well everyone knows when a plane goes down, the first thing they look for is the black box."