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Dave Grohl, As Dave Letterman, Interviews Alice Cooper On 'Kimmel'

Foo Fighters frontmanDave Grohl experienced the best Halloween treat while guest-hosting on “Jimmy Kimmel Live!” Tuesday.

“I can’t believe I get to dress up like David Letterman and interviewAlice Cooper,” Grohl declared.

We can’t believe it either.

But there they were, with Grohl disguised as Letterman in his Santa-like beard, and Cooper stained with fake blood for the ghoulish holiday.

The two discussed pre-concert rituals, which really served as an excuse for Cooper to throw knives at a photo ofMatt Damon. Good to know that Kimmel’scomical feudwith the actor could carry on without him.

Cooper then related a spooky anecdote about the time he and Aerosmith guitarist Joe Perry were coming off rehab stints and they stayed together in a New York house to write a song. But loud noises in the basement and other unexplained events cut their plans short.

Said Cooper: “It’s not like the movies where you go, ‘Let’s get a flashlight and go down and see what it is.’ No, we were out the door.”

Hear the scary details above.

This article originally appeared on HuffPost.