When you were disobedient or did something mischievous as a child how did your parent(s) discipline and knock some sense into you? Did they spank you? If so what with? Take away your privilages (toys, video games, television) for a set amount of time? Did they just slap you around the head? Ground you from leaving the house? Other?
My mum, who can't walk due to a disability, used to give me a swift, short slap around the head whenever I was being a nuisance.
She used to demand I walk over and bend down so she could reach me, subsequently I'd apologise.
It worked most of the time, never had to resort to anything harsher. I was a fairly well behaved kid, least in comparison to children nowadays who set there pets on fire and stab each other etc... so it was an uncommon occurrence which made it all the more effective when she did clout me one.