During a transcontinental flight, a passenger looked out the window
and noticed that two of the jet's engines were on fire.  He began shouting
that the engines were on fire, and pretty soon the rest of the passengers
were in the throes of panic.  Whereupon the pilot appeared in the doorway
to the passenger compartment with a parachute strapped to his back.
"Don't worry, folks," he said cheerfully.  "I'm going for help."