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Dave Grohl spent his Halloween dressed at David Letterman filling in for Jimmy Kimmel.

Confused? Let’s start here: while Kimmel is preparing for his son’s second heart surgery he has handed over hosting duties to some famous friends. Last night was Grohl’s turn.

He walked on stage for the monologue dressed as current day David Letterman with the long beard and classic varsity jacket. After the break, Kristen Bell joined Grohl at the desk to promote “A Bad Moms Christmas,” but all they talked about was “Frozen.”

The Foo Fighters front man, who never passes up the opportunity to jam, begged the Disney star to sing… he also admitted that it would make him the coolest dad ever.

And it did. Watch Kristen Bell and Dave Grohl preform “Do You Want to Build a Snowman” in the key of Metallica.