My little boy is nearly 17 months and is testing his boundaries. For one example he bangs on the tv so we tell him no and remove him from the tv but he runs back to the tv bangs and starts rocking the tv. So we tell him firmly no and remove him but yet again he runs back does the same and laughs as he thinks its a game. What discipline method would be effective at this age? Or is he still too young for anything more?