Sick and tired of their history professor's lewd jokes and sexual innuendo, a group of girls decided that the next time he uttered an inappropriate remark they would get up and leave his class in protest.

However, having overheard their plan and looking to score some points with the professor, a fellow student informed him of their scheme. The next day, after chatting about current events for a few minutes, the teacher suddenly smiled and, making a clever segue, said, "You know, I hear there's a shortage of whores in Paris!"