I had to get the tailgate open

There was a blonde, a brunette, and a red head in a truck. The brunette and
the red head were in the cab and the blond was in the back. The truck goes off
the cliff and into the water. The brunette and the red head go up to the
surface. They wait about 5 minutes and finally the see bubbles and then the
blonde. Hey asked the other two girls, what took you so long? She said I had to
get the tailgate open.