And that's why you should be extra careful when running in the dark. Careful to lift your feet up, cause you can't see that little raised area of sidewalk, and when it catches the toe of your shoe it disturbs your momentum just enough that your body starts to fall forward. But your legs can't quite catch up. And while you try with all your might to right yourself, feeling every muscle fiber in your legs trying to keep you upright. But sometimes its just not enough.
And you fall. And end up with bloodied knees and scraped up palms.
That'll teach you.