Tom Selleck and David Letterman gave an epic performance on Jimmy Kimmel Live Tuesday night.

Or should we say, Kristen Bell dressed as Selleck's Magnum, P.I. character and Dave Grohl dressed as Letterman for Halloween, gave an epic performance. Bell appeared on the late-night show Tuesday, guest hosted by Grohl. 

During the interview, Grohl said being there with Bell was "kind of the biggest deal" to his three daughters. "If I were to jam a song with you, I would become the coolest dad," the Foo Fighters star said.

"I would jam with you! I would, yes! Are you kidding me?" Bell replied. "What do you wanna do?"

Bell then stood up and started singing a song from her 2013 movie Frozen, "Do You Want to Build a Snowman?" During her performance, Grohl got up from his seat and started playing the drums.

The performance then turned into a mash-up with Metallica's song "Enter Sandman" and the result is probably a little surprising and confusing to kids, but pretty awesome at the same time!

Watch the video above to see Bell and Grohl's mash-up!

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