There's a running joke amoung Zalgo's Army regarding said head-cannon. Whenever Zalgo is watching the head-cannon, it will only shoot cannonballs despite odds stacked against it. But as soon as he turns his back, it will shoot Zalgo-only-knows-what. It's gotten to the point where it was temporarily believed that it would only shoot cannonballs under the gaze of Zalgo. However, this was disproven. Once.