[Bill Gates in a restaurant]
After eating, he gave 5$ to the waiter as a tip. The waiter had a strange feeling on his face after Gates gave the tip. Bill Gates realized it and asked; What happened?
Waiter: I'm just amazed because on the same table your son gave me tip of.. 500$.. And you, his father, the richest man in the world only gave me 5$..?
Gates smiled and replied with meaningful words;
Bill Gates: He is a son of the world's richest man, but I am a son of a wood cutter..
p/s: Never forget your past. It's your best teacher.