Metallica vs. Megadeth

Fightin' Words: "Everything about you has been one big charade/ What will you do now that the well's run dry – cry?/ To sell out all your friends and stab them in the back" ('Something I'm Not,' Megadeth)

Megadeth frontman and ex-Metallica member Dave Mustaine said for years that he wasn't credited for Metallica songs he helped write. He and Metallica drummer Lars Ulrich sat down for therapy during the filming of the Metallica doc 'Some Kind of Monster' to try to patch up their feud. When edited footage of the sit-down appeared against Mustaine's wishes, the rivalry kicked back into gear.

Judges' Decision: Megadeth, for accusing Ulrich of "enissophobia" (zing!)