I had this once, in circumstances unrelated to sport. One time I got talked into going to a club - something I don't normally do. It so happened that it was "g

I had this once, in circumstances unrelated to sport. One time I got talked into going to a club - something I don't normally do. It so happened that it was "goth night", so I figured I would spend the night headbanging. After a few hours, when the club was almost closing up I noticed that something was off - my neck muscles felt weak. Next thing I know I'm sitting at the side of the stage with my head down, looking like a case of alcohol poisoning, and can't move. I sat there for half an hour until I regained enough strength to at least somehow make to the exit. Gradually it went away but I only fully recovered the next morning.