Once I sat next to very pretty and chic young (thirty something) Japanese woman on a bus.

She was quite properly ignoring me, reading a book printed in tategami. I couldn't help myself--Despite her somewhat forbidding composure and propriety, I said to her, "Excuse me. You're reading that backwards." It took her a minute, but she started laughing and couldn't stop. "Thank you," she said through her giggles, "I tried reading it the other way, and couldn't make any sense of it."