Deadmau5 managed to troll the hell out of Skrillex tonight by showing up at the Grammy's wearing his phone number on his T-shirt. Yeah, we tried calling it. Yeah, it was busy (but not disconnected yet, amazingly). So is this a sign of an EDM beef war (probably not) or just some good fun on music's biggest night? Regardless, fun times. On another note, what'd you think of Deadmau5's performance with the Foo Fighters? Sound Off in the comments.