Dave Grohl guest-hosts Jimmy Kimmel Live! dressed as bearded David Letterman

Grohl, whose Foo Fighters closed out Letterman’s 32-year late-night run in May 2015, got so annoyed with having to wear a long, flowing beard that he encouraged Letterman to shave it off. The Halloween-themed episode featured guest Kristen Bell dressed as Magnum P.I., and Grohl got her to sing a Frozen-Metallica mashup with him. Wheel of Fortune's Vanna White also made a cameo.