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 bad accident.

"Douche-bag!" 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, douche-bag."