"Hmm," George pondered, letting his gaze drift out the window as they passed slowly through the heart of the city. "Okay, let's see. Sorting books, I could spell dirty words with the titles. And being at a horrible table is probably best, since it would be the back, and there wouldn't be many people to overhear me making rude noises at hilarious times. Lectures about history.... Hm. I got pretty good about innuendo in History of Magic."