A man driving in traffic stops, and suddenly, someone hits the window of his car. He rolls down the window and asks what the other man wants. The other man says: 'The President has been kidnapped and the ransom is $50 million. If the ransom is not paid, the hijacker will pour gasoline and set him on fire. We are collecting contributions. Would you like to participate?' The man in the car asks, 'On average how much are people donating?' The other man replies: 'About 5 to 10 liters'.