The No-Boy Dispenser

Uncle James' chin-up bar was laying on the ground, and after entertaining herself with it for a while, Elliana came up to me and said, "Do you know what this is?"

Me: "What?"

E: "It's a No-Boy Dispenser."

Me: How does it dispense no-boys?"

E: "If a boy sits in it, it will poison him, and then there will be no more boys!"  

Let's hope her theory does not prove correct!