Not serious, but unusual and hurt like a sumbitch:
It was after a kid’s outdoor birthday party, we were cleaning up. We had stuck balloons into the wood deck with thumbtacks.
I was pulling the balloons off when one stubborn thumbtack was not releasing from the deck. I pulled harder. When it finally did release, it sling-shotted right into the middle of my thumbnail, pierced the nail, and stuck there. I had to extract it.
Ouch.
mmm