To be honest, I can't remember where I read it or heard it. Although I do understand the rationale behind it;

You annoy somebody so much that they are considering killing you, now they could do it or they may want to hurt you and your family so badly that they would kill a brother. This would leave you feeling remorseful and subdued.

If your parents knew of this how would they feel towards you?

Now this may have actually happened, I've read a hell of a lot of books, fact & fiction, seen films and documentaries. That sometimes I lose track of what, where and when.

No doubt somebody will be able to put me right, it might even be from a book about english crime, and our feeble attempts to establish crime families.

Don't worry though, I'll soon have a belter of a quote.