Slipknot has one of the grodiest lores in rock music. In their early years, they made a habit of huffing dead birds pre-show, then shitting and vomiting on stage, before throwing it into the crowd. By 1999, the members each had an assigned number, mask, and killer carny costume. Against all odds, their eponymous debut — a nine-man grumble of thrash and death metal — found mainstream success, becoming the fastest-selling album in the genre’s history.