Scootaloo: Raises hoof “Ms. Cheerilee, why are you wearing some dumb foal’s diaper?”
 
Ms.Cheerilee: “Hehe, funny you mention that. Our janitor got a little bit tired of cleaning the school’s bathroom walls and with the price of paint, plumbing, and mirrors that everypony kept ruining, the school district came up with a clever solution.
 
Class Room: Looks worried
 
Sweetie Belle: “W-what is it?”
 
Ms. Cheerilee: “Diapers. As you can see, there’s a changing table in the back and it’s fully stocked for at least the next two weeks. Don’t worry, we have months worth of them in the cabinets though.”
 
Scootaloo: “But, you have to use the diaper too?”
 
Ms.Cheerilee: “Nah, I’m going to wear them to get everypony used to the look of them. Tomorrow the toilet will be fixed again and I’ll have the only key in the room. Anyway, who’s first?”
 
Sweetie Belle: Blushes, raising her hoof