What's Mom Doing to Me?

What is this thing she put over my butt? I don't like it. Not one bit. Is this because I peed in the bed? Twice. I'm sorry Mommy. Please take this thing off me. I promise to be good. I know you were really cross at me for waking you up at 4:30 in the morning the other day. And also for making you take a morning off to go to the laundrymat to clean your comforter. I don't like your "mean" voice. I'm sorry. I really am.

I won't do it again. Now, what exactly is it that I did wrong?