Well, I've done it again!
In my rush to answer the ringing telephone, I hit my pinky toe on the edge of the ottoman in front of the sofa. Ouch!
I've done this before, several times (I'm sort of clumsy). So I didn't think too much about it. But immediately, the right side of my foot all the way around to the ball of my foot began swelling, and turned a dark blue.