While we don't condone violence of any kind, if you're in the front row of a gig on your phone and in plain sight of the band's frontman... well... you're not very clever.
That's exactly what happened at a Slipknot gig recently, when frontman Corey Taylor spotted a fan in the front row obviously sending a very important text or email that just couldn't wait.
He walks up to the fan and slaps the phone out of his hand - leading some fans to criticise him for what they call a 'dick move' and joking about him playing Pokemon GO.
Us? We're with Taylor on this one.
Watch it below (click image to play):