Little Johnny and the Truth

Little Johnny was told by his friend that if you go to your parents and say: "I know the truth," they give you money.

So Little Johnny says to his mum, "I know the truth," so his mum hands him 20 dollars and tells him not to tell anyone. So when Little Johnny’s dad gets home, Little Johnny says, "I know the truth." His dad hands him $50 and says not to tell anyone. So Little Johnny tries it on the postman and says, "I know the truth," and the postman says, "Come here, son."