Disadvantage of class to sleep
Teacher: "You recognize the shortcomings of sleeping in class?"
Student: "recognize."
Teacher: "What is it?"
Student: "The downside is not as good as sleeping in the bed comfortable."

They died
Professor: "Can you tell me those of the greatest scientists of the 17th century some of the things?"
Student: "sir OAKLEY TWITCH SUNGLASSES, they all died."