A professor told dirty jokes in class and the women wanted to protest it.
So they decided that the next time that the professor starts with these kinds of jokes they will all leave the class as a protest.
Somehow the professor heard about the plan.
In the next lecture, in the beginning of the lecture he said: “In Sweden a prostitute makes $2000 per night. “
All the women stood up and started to leave the class.
So he shouted after them: “Where are you going? The plane to Sweden doesn’t take off until the day after tomorrow. “
This joke is included in the Black Book of Jokes. You can order it from here.