WTF

Ok so. Today. It was cold outside. My hands were cold. So I got in the car, shut the door, turned on the heat, and stuck my hands under my legs to warm them up. Then I shivered. Cause, like I said, it was cold. And somehow, the motion of an involuntary shiver while my hands were pinned under my legs caused this loud thundering CRACK to come from my shoulder and it fucking HURT.

It hurt so much I was literally seeing stars, and I thought I was going to pass out right there.

WTF was that? What did I do? I couldn't have dislocated it, could I have? (I didn't)

And so I'm waiting for this searing pain to start, but... it doesn't. After the shock, I guess, that nearly knocked me out, it didn't hurt after that. I moved my arm up and down. Ok. No pain. I got out of the car, just to make sure I could, and stood up, and got back in - Ok. Didn't hurt. So what the fuck was that?

But then later, when I got to work, I realized that it does hurt. When I reach behind me, like, the motion you do to take off your coat? That hurts. Not hideously. Not intolerably. Just in a "hm, something's not right here" kind of way.

And so I repeat: WTF did I do?