Every crash results in a concussion- some mild, others not. Even if you don't hit your helmet on anything. It's not good. I never thought about them. Things like this event was just good fun- life is short and you only live once! Then you get one and that changes. You realize life is actually long so it's best to stay healthy! Have fun but in all the excitement of moments like this, and with all the cheering don't be pressured into doing things that you will later regret.