We've been having a lot of fun posting photos of the recent Big 4 of Thrash reunion, but when it's time to get down to business these guys delivered. And, to have a little fun, Metallica invited the rest of the guys on stage for a slay-mega-thrash-tallica-jamthrax. The result is a cover of Diamondhead's Am I Evil, and sees Mustaine hug it out with Lars and James beforehand. Really, there are no jokes to be made here. This is just cool as fuck. I wish I was there.