When Pigs Fly
The phrase "When Pigs Fly" appears to be a traditional Scottish proverb, one that makes its first printed appearance in 1586 in an English-Latin dictionary for children. Although a pig may have been carried aloft in a balloon ascension prior to the invention of the airplane, the first "flying pig" I can find took to the skies on November 4th, 1909, when John Theodore Cuthbert Moore-Brabazon (great British name, eh?), carried a small pig in a waste-paper basket on a flight. I love the sign on the basket: "I am the first pig to fly."