Son: How much does it cost to get married, Dad? Father: I don't know son, I'm still paying for it. Son: Is it true? Dad, I heard that in India, a man doesn't know his wife until he marries. Father: That happens everywhere, son, everywhere.
When the teacher got frustrated because the students weren't paying attention to the class about Isaac Newton, he exclaimed, "Don't you understand the gravity of this situation?"