Sometimes, you just gotta get on stage with an American heavy metal band and give it your all.

That's what happened at Five Finger Death Punch's gig at their Oslo gig last weekend, when a metal-loving granny was brought on stage by the Las Vegas band during their song 'Jekyll and Hyde'.

To her credit, she played air guitar and gave the 'devil horns' sign with gusto, bounding around the stage and assisting frontman Ivan Moody with some of his lines.

You're never too old for a good headbang.

Watch it below: