Watch as Slipknot soundchecks "Liberate" prior to the show completely unmasked. And yes, they sound exactly as vicious as they do during an actual show.

Rare, newly unearthed, footage of an unmasked Slipknot soundchecking for a hometown show Des Moines on New Year's Day 2000 has been posted on an fan account on Instagram. Having played the Super ...