My son is almost 19 months, and very much all boy. Here's what I do...after I've given him several warnings (I figure 3 strikes type thing), I sit him in his chair in the kitchen next to the refrigerator, and set my kitchen timer. It's magnetic (obviously stuck on the refrigerator), so I move it down to his eye level. I set it for 1 minute (it's supposed to be 1 minute for every year...I suppose I could add on another 30 seconds now), and he has to sit still for the entire minute. He can't get off the chair, and if he does...the time restarts. When the timer goes off, his punishment is over. He gets a big hug and kiss, and gets to go play. With the timer being digital, he can actually see it counting down. Hope this helps or at least gives you a few ideas.