A blonde, a brunette, and a man are driving in their pick-up truck.
The brunette was sitting up front with the man and the blonde was in
the back. While driving across a bridge the man lost control of the
truck and drove over the side of the bridge. After the truck had sunk,
the man and brunette fought their way out of the cab and surfaced. A
couple of minutes later the blonde came out of the water, panting and
breathless.
''Where have you been?'' asked the man.
''I can't believe you left me down there! I couldn't get the tailgate
open!''