Here are some facts that might help you decide if Slipknot black metal The members of the band often use pseudonyms, including numbers instead of names (e.g., "#8"). They wear matching uniforms on stage (black jumpsuits with matching Mardi Gras masks). They wear gimp-type masks (see picture). The band mascot is a clown. Clowns are popular in horror movies and among serial killers. The horror genre and serial killers often overlap with Black Metal interests, such as the occult and Satanism.