I was talking on the phone while walking down the stairs.
I somehow slipped. I think my sock slid while I had one foot in the air. With one hand, I grabbed the railing, but the other hand was holding the phone. My elbow was rammed into the staircase and probably took most of the shock. This caused me to hang up on the conversation abruptly, too. :(
My shoulder hurts, and my elbow is scuffed up kind of badly. On the plus side, however, I have a really cool bandage! Check it out: