A blonde, a brunette, and a man are driving in their pick-up truck.

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!''