For 25 years, Punkin Chunkin has hit the skies. This year, Science Channel is honoring the backyard engineers who turn pumpkins into projectiles with an inside look at the 2010 championship. The World Championship Punkin Chunkin Association (WCPCA) is a nonprofit association started in 1986 that hosts the Punkin' Chunkin' World Championships, an event which raises money for scholarships and charitable organizations. less