I twisted a vertebra in my neck. Turns out it was from riding, when whatever horse I was riding at the time would stop dead from a gallop and I'd bounce in my saddle. It happened several times within a few days and apparently messed up my spine a good one. I was in the ER three times for it before one nurse suggested I go to a chiropractor since they couldn't figure it out. Yep. Cracked my neck and I was back to normal. Ha.
Ohhh very painful! Broke my tailbone 3 days ago and still hurt when I sit on a hard chair.