" She prowled the city on moonlit nights, and OK, there was the occasional chicken, but she always remembered where she'd been and went round the next day to shove some money under the door. It was hard to be a vegetarian who had to pick bits of meat out of her teeth in the morning. She was definately on top of it, though. It was easy to be a vegetarian by day. It was preventing yourself from becoming a humanitarian at night that took the real effort. "

― Terry Pratchett , Men at Arms (Discworld, #15; City Watch #2)