When it was first announced that NY rapper Jay-Z would be headlining England's Glastonburry Festival, it raised a few eyebrows and even prompted Oasis front-man Liam Gallagher to voice his displeasure to the music media. Well as a way of returning the favor, the "best rapper alive" tried to give Oasis the 'ol middle finger by starting his set with a somewhat lack-luster version of "Wonderwall" and then blowing it away by breaking into "99 Problems." Of course, being that the festival was in England, most of the drunken fans in attendance were more than happy to sing-a-long with their favorite Oasis song and seemed to have missed the joke.