He is like that in real life, too... I am in his department, and every single social event ends with him surrounded by a group of people, listening to his hilar

He is like that in real life, too... I am in his department, and every single social event ends with him surrounded by a group of people, listening to his hilarious rants. At the same time, he's a great teacher, too. Somehow you learn things while listening to 90 minutes of his stand-up comedy.