Panic! At The Disco‘s Reading Festival set yesterday opened with their frontman being hit square in the face by a flying bottle. After falling to the floor clutching his face, the rest of the band stopped their cover of Radiohead’s ‘Karma Police’ and the band’s crew came to his aid. After five or so minutes he got up and carried on. Later in the day, Fall Out Boy‘s Pete Wentz urged the crowd to throw bottles at each other, probably as a response to his friend getting hurt…