A man is driving his five year old to a friend’s house when another car races in front and cuts them off, nearly causing an accident.
"Douchebag!" the father yells.
A moment later he realizes the indiscretion, pulls over, and turns to face his son.
"Your father just said a bad word," he says.
"I was angry at that driver, but that was no excuse for what I said. It was wrong. But just because I said it, it doesn’t make it right, and I don’t ever want to hear you saying it. Is that clear?"
His son looks at him and says: "Too late, douchebag."