Dave Grohl was the guest host of Jimmy Kimmel Live last night, and had a ton of surprises in store for the studio audience. One of the surprises included a special performance with actress Kristen Bell. Dressed as David Letterman and Tom Selleck, the two performed a unique Halloween mash-up of the Frozen ballad “Do You Want to Build a Snowman?” and Metallica‘s “Enter Sandman.” Check it out below!

Watch more of Dave Grohl’s takeover here.