My dad's raised voice would bring me up short, but my brother was a terrorist without compunction. Our mom was always whacking him on the skull with a butter knife when he lipped off at the table, and Dad had to put his head through a wall when he was about 18. Around 25, a father himself, with a Laylithe type (tarot, zodiac, drugs, neglectful mother, hosemonster) as a wife, he finally got square and on the level. Became financially successful and ditched his dizzy wife for a solid citizen wife. Was it thanks to Mom and Dad continually thumping him? Who knows?