Bass Pro Shop - Guy is looking for 45 Auto ammo. They actually had different brands in that caliber on the shelf. BPS employee is opening up various boxes and allowing the customer to examine the ammo. They open up a box of the Hornady ZombieMax. Customer comments on the green plastic plug in the cavity of the hollow point bullet. BPS employee tells the customer "that's to keep air from filling up the hollow point and expanding it when you shoot it."
Customer: "Really. How much air does it take to do that?"
BPS employee: "Not much at all".