I worked in the biology department at Buffalo State College in New York. The Great Lakes Laboratory, also stationed at the college, employed a licensed boat captain to man its research vessel. It was common knowledge that the captain couldn't swim. When newcomers learned of this, they would approach him about it.

"Is it true?" one of them asked incredulously. "You, a boat captain, can't swim?"

"No, I can't," he replied. "Can pilots fly?"