I do actually agree with Ekra - if I ever feel the desire to lash out, I distance my self from the situation.
Ds knows it is wrong to hit others. I don't think even if he could remember what I did to him (remember, it was only a max. of 5 times, spread over about 18 months, 4 years ago), he would even categorise it as hitting him.
We are always using our controlling power - if not, we are not doing our jobs right. We also use our superior strength to control our children, such as when we force them to stay with us in busy crowds when they are wee (or am I the only mother to have had to hold on hard to ds' hand when he would really rather be somewhere else ). In this particular circumsntace, it wasn't power I used, but shock value.
This is a scenario that another Mumsnetter once outlined, "He got a 'don't push dd away', then a smack on the hand and a 'I told you not do push dd'. Then cuddle resumed exactly as before, with one on each side. Status quo undisturbed. Alternative (time-out) would be: stand up off the couch, pick him up and carry him screaming up the stairs, shut door of room and wait 60 seconds, dd starts wailing because she was enjoying the cuddle with mummy and doesn't want me to leave, I come back to ds and give explanation again about bad behaviour, then a cuddle to help him get over tears, then return to dd who needs to be calmed and settled again... all that palaver involves FAR more of mummy's time and attention than a quick smack, which in this case did not cause tears (just a bottom lip poked out) - the whole thing was over, from smack to resumption of status quo in less than 20-30 seconds. Ds absolutely HATES going to his room - much more than a smack. But the smack seems just as effective at the right moment in curbing the behaviour. So why would I choose the option that distresses him more? Not always, but often, hauling him upstairs for time-out escalates the emotions on both sides. He gets distraught because he regrets it so much and doesn't want to go upstairs, and then he struggles and resists going up to his room, which distresses dd so she starts crying etc - and the whole thing can (doesn't always) become a much more heated, emotional thing than the smack typically does - often a smack situation remains very calm, the point that I'm serious is made, the smack does in fact stop the behaviour, but everyone is allowed to continue on as before (just minus the bad behaviour). Much calmer household, and much more pleasant for both children. "
What would you have suggested instead?