Say, "Okay" and follow Dudley.
From Create Your Own Story
Dudley leads you to the bathroom. He pushes you towards the toilet, grips your hair and pushes your head in. He holds you in so long that you have to swallow toilet water, and you can tell that Dudley went without flushing. When he finally lets go, you bring your head up so fast that droplets of fecal matter spray everywhere.
You scream, "What the bloody hell did you do that for?"
Uncle Vernon comes in. "No ruddy language in this house. Dudley, hit him with the Smeltings stick." The Smeltings stick was part of the uniform, and it was used for hitting other kids when the teachers weren't looking. "Builds character, I say." Uncle Vernon said earlier. Dudley brings the Smeltings stick down hard on your back.