Punkin chunkin, or as it is sometimes called pumpkin chucking, is the sport of hurling a pumpkin solely by mechanical means for distance. The devices used include slingshots, catapults, centrifugals, trebuchets, and pneumatic (air) cannons. Punkin chunkin competitions, formal and informal, exist throughout the United States in the autumn, particularly in early November as a means to dispose of surplus pumpkins from Halloween. World Championship Punkin Chunkin, held annually in November in Delaware by the World Championship Punkin Chunkin Association (WCPCA), was the first and largest annual competition. The event ran annually from 1985 to 2013; a myriad of legal and logistical problems caused multiple events to be cancelled after that, and subsequent championships have been more sporadic. A European Championship has been held in Bikschote, Belgium each year since 2004. The Guinness world record shot is held by a pneumatic cannon dubbed "Big 10 Inch", at , on September 9, 2010 in Moab, Utah. The shot received certification from Guinness World Records in early February 2011. Big 10 Inch has also competed many times at the WCPC event in Delaware. The WCPCA World Record, which includes only shots made at the annual World Championship event, is held by Team American Chunker, captained by Brian Labrie of New Hampshire, at on November 1, 2013, in Bridgeville, Delaware. The difference in results between Delaware and Utah may be due to the higher, thinner, drier air found in Utah providing less resistance and drag, thus greater range. The range achieved by devices depends on their mass, shape, and size; the yield limits, stiffness, pitch, and elevation of the hurler, and the weather. The choice of pumpkin is another important variable; Casper, Lumina, and La Estrella are the most common varieties used for competitions since they tend to have thicker rinds than other varieties and can thus withstand greater forces during launch. One of the core rules for competition is that the pumpkin must remain whole after leaving the device until hitting the ground for the chunk to count. Pumpkins that burst after leaving the barrel or sling are referred to as "pie" (short for "pumpkin pie in the sky"); such launches are disqualified under WCPC rules. Punkin Chunkin events, usually independently organized, are held throughout the United States, with active annual contests in Clayton, New York, Ellicottville, New York and Bald Eagle State Park in Centre County, Pennsylvania. A variant of the