Jay Z and 50 Cent FACEOOF

50 Cent and Jay-Z ran into each other backstage last week at Comerica Park in Detroit, where Jigga and Eminem were playing. 50 Tweeted about their brief conversation, saying he asked Jay, "What's up [man] -- we gonna kill each other or what?" Hova responded, "And [mess] up the money? I ain't with it."