The anthropology professor was well known for making sexist comments and jokes in class much to the dismay of the feminist female students. The women students got together outside class and decided that after the next sexist comment from the professor they would stand up and walk out of class in solidarity.
The next day the professor, while lecturing on a certain African tribe, said: " and you ladies will be glad to know that the average penis size of the tribesmen is 12 inches!"
At that moment all the women in the class stood up and began filing out. The professor then said: "Wait! Wait ladies! The next flight to Nairobi doesn't leave until tomorrow morning!"