Judi strolled up to a guest at the party. She had heard him addressed as doctor and now she said coyly, "Doctor, may I ask a question?"

"Certainly," he said.

"Lately," said Judi, "I have been having a funny pain right here under the heart . . ."

The guest interrupted uncomfortably and said, "I'm terribly sorry, Judi, but I'm a doctor of philosophy."

"Oooh," she said, "I'm sorry!"

She turned away, but then overcome with curiosity, she turned back. "Just one more question, doctor. Tell me, what kind of disease is 'philosophy'?"