I think anyways. I was playing football with my freind and I was doing a flag route and when I made my cut, I slipped and fell. When I fell I landed on my should and the force was so hard that my head whipped back and my jaw hit my shoulder. I heard a pop. It felt as if someone had punched me in the jaw. I also hit my head.
Today my neck is pretty stiff. My head aches just a bit too if I am not keeping my self busy.