That's the great thing about having a kit. Instead of just one voodoo doll, you can make several. You know that dodgeball is coming up and the opposing team is nearly always Billy, Roger, Chad, Ryan, Jeff, Jared, Mike, Dan, and Hank. You could get vengeance on all nine at once. You make only one voodoo doll but you attach hair from all nine guys so that whatever you do to the one doll, happens to all nine guys at once.
The dodgeball game begins and just as you predicted, all nine guys are on the same team. To make it even better, you're playing shirts while the opposing team is playing skins. That means they are already half exposed without shirts.
You let yourself be tagged out early so that you can hang out on the bleachers using your voodoo doll. Now it's time to help your team. You make all nine guys hips grow stretching out their shorts then suddenly you shrink their hips so their shorts fall down. You hide the voodoo doll and laugh at the sight of nine guys tripping over their shorts trying to get covered up. Chad says, "Yea, yea, you saw what I got, what makes all the girls happy."
You couldn't let Chad get away with that but you couldn't punish Chad without hitting the other eight. Still you caused all of their dicks to shrink and then you gave all nine a quick swat. You make them lose their shorts again and this time, Chad can't brag about what he ain't got.