So they decided that in the next time that the professor will start with these kind of jokes they all will 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."
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