When my son is old enough to understand though, I will deffetely be using more 'matured' disipline for the age. Growling (and I dont mean like a dog growl, I mean low pitched 'yell' so to speak) works for now because when I growl at him he pays attention and knows Im angry.
When he is older, I will start time out. Then I older again, I will make sure I explain to him why he got told off/time out/growled at. When hes in his teens I will mostly just take away something like a game console or internet rights etc.