When I was 15 I was putting together a First Aid kit to go camping. I left the room and came back in promptly stepping on a scalpel blade – a lot of blood and no camping.
My BiL was sweeping up the workroom and the brush compressed a Stanley blade lying on the floor – this sprang up directly into his right eye and went in about 50%. He didn’t know what had happened but his friend, having almost fainted, took him to hospital where they took his eye out, removed the blade and then re-inserted his eye. Amazingly he has 50% vision