There was an naughty lecturer who started every class with a
dirty joke.
After one particularly kinky example, the girls in the class
decided to
walk out the next time he started those dirty jokes.
The lecturer heard about their plan, so the next morning he
walked in and said: "Good morning, class. Did you hear the one
about the shortage of prostitutes in China?"
With that, all the girls stood up and headed for the door.
"Wait, ladies," cried the
lecturer. "The boat doesn't leave until tomorrow!"
