See Slipknot Play Ferocious "Heretic Anthem" on 'Conan' in 2001
Conan O'Brien: "May God help us all"
Music
Slipknot on Darkness, Anger, Addiction Behind 'Iowa': "We Almost All Died"
Corey Taylor, Clown, Joey Jordison, Paul Gray and more look back on band's most brutal album in classic 2011 story