If you stayed up late last night, you might have caught the genius of Dave Grohl in front of the camera. He served as guest host for Jimmy Kimmel on Halloween. When Dave reveals that his daughters love Kristen Bell’s song “Do You Want to Build a Snowman?” from Frozen they decide to perform a mash-up of it with Metallica’s “Enter Sandman.” And the awesome is below.

PS: Dave Grohl as David Letterman is everything.