Frozen‘s Kristen Bell and rockstar Dave Grohl united for an epic musical mashup that you have to see to believe!

Let it go? Never.

Late night host Jimmy Kimmel is taking a week off hosting Jimmy Kimmel Live to deal with family issues, and Dave Grohl of Nirvana and The Foo Fighters fame is stepping in for the week.

During the Halloween show, Grohl and the evening’s guest Kristen Bell — both in costumes of course — had a fun surprise in store: a rendition of Frozen‘s “Do You Want to Build a Snowman” to the tune of… Metallica.

It’s pretty incredible, honestly. Just watch it:

Props to Bell, whose costume is pretty much what I imagined that sadly not-happening female-led Magnum P.I. reboot would look like.

Don’t forget to watch her incredible comedy series The Good Place Thursday night on NBC!

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