The waiter was taken aback and looked blankly at Bill Gates.
Bill Gates asked the waiter, "Is something wrong?"
The waiter said, "Sir, I am a little shocked. Your son was here last week and dined at the same table. He gave another waiter a tip of $ 1000 and you, his father - the richest man in the world - you only gave me $ 10?"
Bill Gates smiled & replied in a philosophical mood, "He is the son of the world's richest man, but I am the son of a wood cutter!!"