A real potato would have broken ribs and perhaps have punctured a lung and/or stopped his heart. My nephew's spud gun is a formidable weapon. I'm pretty sure that a head-shot at the range shown in the video would be fatal. When you can blow a hole in a barn wall 40-50 feet away with a chunk of potato, that's pretty scary. I wouldn't want to get hit with a Nerf ball out of that bazooka!I think that Hypatia is right about that being a tennis ball. It makes me wonder what kind of damage a real potato would have done.