Where Did That Come From?

I seem to have developed a bruise on my right leg as if somebody half bit me. Or bit me all the way, but had no bottom teeth. Or perhaps no top teeth, depending on their biting orientation.

One way or the other, I'm going to be on the lookout for crazed people with removable sets of teeth. Unfortunately I see a lot of those kind of people, so I'll have to be vigilant.