At a boat rental concession the manager spots a boat out on a lake and yells through his megaphone,"Number 99,come in please. Your time is up."
Several minutes pass but the boat doesn't return.
"Boat number 99," He again hollers, "Return to the dock immediately or I'll have to charge you over time."
"Something's wrong!We only have 75 boats."the manager pauses then raises his megaphone,"Boat number 66,are you okay?"