A professor who always wore a cap bought 2 parrots - one male and one female but he could not differentiate them. He then decided to differentiate them when they were f***king as the male would be on top of the female. While the parrots were f**king, the professor caught the one on top and assuming that it was the male one, he shaved off all the hair on its head and the parrot felt very bad. The next day, the professor invited guests to his house and went to the bar to offer them drinks. As he bent to pour the drinks, his cap fell off and his head was bald. The parrot on seeing the head screamed "professor, professor were u caught phyuking too"