If she gets the lesson, why am I paying tuition?

Last night, went upstairs to Avocado's room to say good night, tuck her in, surgically remove the cell phone from her hand, etc. Mission accomplished, I made my way down the cluttered deathtrap which is the stairs. In the dark. And for the first time, slipped on a piece of paper and just caught myself from landing face first. At the cost of twisting merry hell out of my right (read, most important) arm. I didn't break anything, I have full range of movement, etc. It just aches like hell, even now.

Of course, A was deeply contrite and promised to clean up the stairs of death. But really. Shouldn't she be the one falling and being all full of Ow?