When pigs fly
The phrase "when pigs fly" (alternatively, "pigs might fly") is an adynaton—a figure of speech so hyperbolic that it describes an impossibility. The implication of such a phrase is that the circumstances in question (the adynaton, and the circumstances to which the adynaton is being applied) will never occur.
"When pigs fly" is an adynaton, a way of saying that something will never happen. The phrase is often used for humorous effect, to scoff at over-ambition. There are numerous variations on the theme; when an individual with a reputation for failure finally succeeds, onlookers may sarcastically claim to see a flying pig. ("Hey look! A flying pig!")  Other variations on the phrase include "And pigs will fly", this one in retort to an outlandish statement.
An example occurs in the film The Eagle Has Landed: an Irish secret agent working for the Nazis replies to a German general speaking of Germany's shortly winning World War II, "Pigs may fly, General, but I doubt it!" Later, when the Irishman sees German soldiers parachuting before an attack, he says to himself, "Mother of God! Flying pigs!"
An identical phrase, used to express impossibilities, exists in Romanian, Când o zbura porcul, literally meaning "When the pig shall fly"; an equivalent also implying an animal is La Paștele cailor, literally: "on horses' Easter". Similar phrases in English include "when hell freezes over", the Latin expression "to the Greek calends", and "and monkeys might fly out of my butt", popularized in Wayne's World skits and movies. They are examples of adynata. In Finnish, the expression "kun lehmät lentävät" (when cows fly) is used because of its alliteration. In French, the most common expression is "quand les poules auront des dents" (when hens will have teeth).
In Polish, a similar expression is "See a tank rolling in here?", while simultaneously lowering a lower eyelid with a finger. Sometimes, when in return to this a slightly more limited, but still improbable answer is given, the speaker repeats the gesture, stating: "Maybe at least a gun barrel sticks out?":
- "I'm sure that the cows will make a permanent colony on the Moon by the end of 2012."
- "Yeah, sure. See a tank rolling in here?" (lowering the eyelid)
- "Well, maybe not 2012, but 2013, surely."
- "Maybe at least a gun barrel sticks out?" (repeating the gesture.)
The idiom is apparently derived from a centuries-old Scottish proverb, though some other references to pigs flying or pigs with wings are more famous. At least one appears in the works of Lewis Carroll:
"Thinking again?" the Duchess asked, with another dig of her sharp little chin.
"I've a right to think," said Alice sharply, for she was beginning to feel a little worried.
"Just about as much right," said the Duchess, "as pigs have to fly...." — Alice's Adventures in Wonderland, Chapter 9.
American literature author John Steinbeck was told by his professor that he would be an author when pigs flew. When he eventually became a novelist, he started to print every book he wrote with the insignia "Ad astra per alas porci" (to the stars on the wings of a pig). He sometimes added an image of a flying pig, called "Pigasus".
In popular culture
- In Lewis Carroll's Through the Looking-Glass (1872), the poem "The Walrus and the Carpenter" poses the question of "whether pigs have wings".
- Pigasus was a flying pig character in the Oz books written by Ruth Plumly Thompson in the 1930s.
- Because of the historical importance of the pig industry to the city, prominent in the local iconography of Cincinnati (nicknamed 'Porkopolis') are such events as the Big Pig Gig and the Flying Pig Marathon. Public art around town features flying pigs.
- In Grand Prairie, TX, the semi-pro baseball team is the (Grand Prairie AirHogs). In advertising, they have used the slogan "Where Hogs fly".
- In the 1968 movie The Lion in Winter, King Henry II tells his wife Eleanor of Aquitaine "When pigs have wings!". She replies "There'll be pork in the trees come morning!"
- Pink Floyd had a flying pig on the cover of the Animals album. This clearly ties in with the album's songs "Pigs On The Wing". Since then the group has used a flying pig as a prop for concerts. See Pink Floyd pigs.
- In Alice, a popular TV series based on the 1974 movie Alice Doesn't Live Here Any More. Alice (Linda Lavin) worked at Mel's Diner along with a spunky waitress named Flo (Polly Holliday). Flo spoke with a southern twang, and one of her favorite sayings was, "When Pigs Fly!"
- In The Simpsons episode, "Lisa the Vegetarian", Lisa pushes Homer's prize pig down a hill into a river, where it ends up getting shot through the air by a dam's spillway suction. In his office Mr. Burns says to Smithers he would like to do something charitable with his wealth, donating a million dollars to the orphanage. Smithers becomes confused at this, and Burns answers "when pigs fly". The pig then passes his window in flight, much to their surprise, at which point he admits he would still like to keep his money.
- In the Scott Pilgrim vs. the World: The Game subspace highway screens, players may be rewarded with money by destroying flying Piggy Banks.
- In Hexen the player can be turned into a pig and use wings of wrath, this results in a flying pig.
- Arjen Anthony Lucassen's second solo album, Lost in the New Real features a track titled "Where pigs fly".
- In the UK BBC One series called ShakespeaRe-Told adaptation of Macbeth, the character Joe Macbeth's monologue "Is that a [police] helicopter? Is it landing on this building? Pigs will fly! Pigs will fly!" It is the film's translation of "The Birnam Wood" reference to the warning given to Macbeth in the Shakespeare play of the same name, in which he is warned that "Macbeth shall never vanquish'd be until / Great Birnam wood to high Dunsinane hill / Shall come against him."
- After the New Orleans Saints, long known for their lack of success, won the 2009 NFC Championship Game by making a field goal in sudden death overtime, longtime Saints radio announcer Jim Henderson exclaimed, "Pigs have flown! Hell has frozen over! The Saints are on their way to the Super Bowl!"
- Flying pigs were seen in the film Nanny McPhee and the Big Bang and were a large part of the promotion related to it, including its major promotional posters. The original Nanny McPhee film had featured the phrase "snow in August" as a similar reference to something that was supposed to be impossible.
- The cover of Stephen Colbert's adult-targeted picture book I Am a Pole (And So Can You!) features an emblem stating that it is a "Caldecott Eligible Book" and a picture of Colbert riding a flying pig, a tongue-in-cheek reference to the book's actual likelihood of being nominated for this award.
- In the third season of the Canadian sketch comedy series The Kids in the Hall, a flying pig (portrayed by Bruce McCulloch) appeared in several sketches to entertain people who had been waiting in long lines.
- In Eminem's 2013 song "Legacy", a variant phrase of this is said: "The day you beat me, pigs will fly out my ass into a flying saucer full of Italian sausage!"
- In The 7D episode "When Pigs Fly", Hildy and Grim Gloom use a spell to give the pigs owned by the farmer Zoinky McZoinks wings and control them as part of their plan to eat all the food in Jollywood in order to cause its citizens to head to Hildegard Estates to become their minions. The 7D managed to thwart the plan by coating the Glooms' house in chocolate. By the end of the episode, the flying pigs were returned to Zoinky McZoinks who managed to make some money off the flying pigs.
- In Star vs. the Forces of Evil episode "Brittney's Party", Brittney Wong told Star that she will be invited to her birthday party "when pigs fly". Star took it literally and used her wand to create an actual flying pig in order to get invited.
- On the wall of a building along Biscayne Blvd. near 81st St. in Miami, Florida (see illustration).
- In a self-effacing reference to their less-than-stellar record, the log canoe Edmee S. has adopted a flying pig as their mascot.
- "Pigs might fly". World Wide Words. 2002-04-06. Retrieved 2013-04-14.
- Haylett, Trevor (June 4, 1993). "Tennis: Martina primed for revenge". The Independent. Retrieved May 13, 2009.
- John Steinbeck: A Biography, Jay Parini, Holt Publishing, 1996
- Jack Snow, Who's Who in Oz, Chicago, Reilly & Lee, 1954; New York, Peter Bedrick Books, 1988; p. 161.
- Grace, Kevin (Jan 4, 2012). "Legendary Locals of Cincinnati". Arcadia Publishing. p. 9. Retrieved 2013-05-07.
- Rick Jervis, "Saints, Colts fans celebrate victories", USA Today, January 26, 2010.
- Sean O'Neal (June 5, 2013). "10 episodes that take you inside the weird world of The Kids In The Hall". The A.V. Club.
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