In the clip, Clown reasoned that the mask was indicative of some personal turmoil he’d been through during Slipknot’s previous album cycle, so he didn’t want to talk or be seen while wearing it.

Now, in an excerpt from a new book about the trek, it’s been revealed that at the Wisconsin stop of the show, Slipknot’s Shawn “Clown” Crahan got maced by a security guard because someone in Slipknot ...