While shooting her film, The Hive, Halle Berry suffered a “minor head injury” while filming a fight sequence. The story is Halle fell and hit her head on concrete. People around her began worrying when she started throwing up (symptom of a concussion). She was taken to Cedars Sinai to be checked out and was released shortly after.
Well, good thing people recognized the concussion thing. I would have still been standing there going, “Aww, widdle baby hit her head? Poor widdle baby gonna cry?”