Nothing makes for a cheerier Mother's Day celebration than invoking the plight of caged pigs. In 2008, PETA put a naked pregnant woman in a pen in London to encourage people to eat vegetarian and to call attention to the fact that all days are bad days for knocked-up sows. The temperature in London at the time was a brisk 40°F, suggesting that the exhibitionist who played along may have been as nutty as whoever dreamed up this act of lunacy in the first place.