Well, this is awkward.



While accepting the award for 'Best Metal Performance' for "Dystopia" at the 59th annual Grammys, Megadeth walked onstage... to "Master of Puppets" by Metallica.



Not only is this a right-royal cock up by any means, it's also extra cringe-worthy considering the history between two bands.



Megadeth graciously accepted the award and made no mention of the error, but you can tell everyone's dying inside a little bit.



Have a look at the video above...