Thinness

Former CBS news anchor Walter Cronkite was traveling through an airport with his wife, Betsy, when he was approached by a woman who thought he looked familiar.

"You know, you look a lot like Waler Cronkite before he died, only a bit heavier," she observed.

"I've heard that," said the gravelly-voiced newsman, who then turned to his wife and asked,

"What did Cronkite die of?"

Without missing a beat, Betsy responded, "Thinness."