An airplane flying over the Atlantic lost one of its four engines, and the pilot came on to reassure the passengers. “Nothing to fear,” he said, “we’ll just be half an hour late arriving in New York.” A while later, another engine was lost. “Nothing to fear,” said the pilot again, “we’ll be an hour late now but we’re still safe.” Later, a third engine went out, and the pilot informed the passengers that arrival time would now be two hours late. One of the passengers turned to his seatmate and said, “If that last engine goes, we’ll be up here forever!”