USF can now add Quidditch to its very active sports community. The sport, popularized by J.K. Rowling’s “Harry Potter” novels, spawned an International Quidditch Association spanning 800 registered teams across the world. Zach Cornett and Lindsay Fussell founded USF Quidditch. “Lindsay heard about it from down at Ringling,” Cornett said. “They helped her start it.