My friend has a really low ceiling in his room, and it's really small so we nailed a string long enough to go around the whole room to the center of the ceiling and attached a lighter to the other end. Now you can just pass the lighter around with the bowl and no one can steal it because it's on a string. And if some one in the circle is being an asshole, you can grab the lighter and whip it at them, and it comes right back to you because it's hanging from a string.