Seat Belt

SEAT BELT
Bill was taking a flight to New York. He boards the plane, finds his seat and settles in, but does not fasten his seatbelt. The flight attendant comes down the aisle and see Bill's unfastened seatbelt and says, "Sir, you need to fasten your seatbelt for takeoff."
Macho Bill says, "Not necessary to do that, Superman doesn't need a seatbelt."
"Superman," the flight attendant said, "doesn't need an airplane either."