Mistakes.

When a plumber makes a mistake he charges twice for it.

When a lawyer makes a mistake it's just what he wanted, because he has a chance to try the case all over again.

When a carpenter makes a mistake it's just what he expected, because chances are ten to one he never learned the trade.

When a doctor makes a mistake he buries it.

When a judge makes a mistake it becomes a law of the land.

When an electrician makes a mistake, he blames it on induction—nobody knows what that is.

When a preacher makes a mistake, nobody knows the difference.

But when an editor makes a mistake, Good Night!