Dave Grohl on Metallica -- Enter Suck, Man

12/18/2008 2:28 PM PST BY TMZ STAFF
Dave Grohl lives in a world of sarcasm -- so while you may agree with him when he says Metallica is "lame" and "sucks," it's probably not what he meant ...

His thoughts on the new Guns 'n Roses album though -- totally authentic.