Jay-Z shocked a crowd of Linkin Park fans when he joined the rap rock band onstage at New York's Madison Square Garden Thursday night. Jigga and the band performed their mash-up hit 'Numb/Encore' and 'Jigga What/Faint' from 2004's collaborative effort 'Collision Course.' Fans of the hip-hop mogul can catch him on tour with Mary J. Blige, beginning March 22 in Miami.