"What are you doing in there, waxing your mustache?” Iggy yelled, pounding on the bathroom door. I yanked the door open and pushed him backward hard, making him stagger. “I don’t have a mustache, you idiot!” Iggy giggled and put his arms up to protect himself in case I punched him. “And you know what?” I added. “You don’t have one either. Well, maybe in a couple years. You can always hope.” I left him in the hallway, anxiously fingering his upper lip."

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I took a wrong turn on the way to the bathroom and found myself in a beautifully proportioned room I had never seen before, containing a really rather magnificent collection of chamberpots. When I went back to investigate more closely, I discovered that the room had vanished. But I must keep an eye out for it. Possibly it is only accessible at five thirty in the morning. Or it may only appear at the quarter moon - or when the seeker has an exceptionally full bladder.

— J. K. Rowling