One of the things that has been going on at the end of Metallica's set at the Big Four gigs is that they bring out members of Anthrax, Megadeth and Slayer to jam on a track they all love.  They all did a version of the Misfits "Die, Die My Darling" and this time they decided to rock out to some Motorhead.  It looks like some listener shot footage from the show at Yankee Stadium, but the quality is ok.  So if you didn't get to be there, live vicariously through this.