For my kids, it depends on the child. For my oldest, it would be temporary grounding from the phone. For my middle, it would be temporary grounding from the computer. For my youngest, it would be a time out in his room. They each have their own personalities, so each of their "ultimate" punishments would be different.

My parenting philosophy is to help my kids learn to be independent thinkers, responsible for their own behavior, so I try not to use a lot of rewards/punishments. We have a lot of conversations about what is right/wrong and why. I want my kids to be free to ask questions.

I honestly can't think of a situation where I would feel that I needed to hit my child.