Remember the video of a grandma enjoying a Slipknot concert from a few years ago? She's going viral again, and has even received a nod from fellow metal grandma, Sharon Osbourne.

Slipknot's Clown has shared details of his worst ever on-stage injury - so bad that "people would vomit when they saw it".

What was the worst injury that Slipknot 's Shawn "Clown" Crahan ever experienced? It's a pretty brutal one that's not for the ...