Broken cycling helmet
Lucky he was wearing a helmet. Not broken completely, but fractured. It worked.
Nick (my son) came off a Scott Genius 20 mountain bike at the weekend. He was riding on an MTB trail and came to a jump. As he went upwards his shoes became detached from his SPDs. He lost his balance: the bike went one way, he went the other. He crashed down onto his right shoulder and his head hit the ground. He's okay. X-ray shows no breaks or other damage. Today, one of my other sons has gone off on his MTB not wearing a helmet! Nothing I can do of course.