Will Ferrell and John C. Reilly Reenact a Christmas ClassicWill Ferrell and John C. Reilly are at it again, reenacting a classic video of Bing Crosby and David Bowie's 1977 medley of 'Peace on Earth' and 'Little Drummer Boy.'

Most of the FunnyOrDie clip is an exact recreation of the Crosby/Bowie collaboration. Reilly and Ferrell, who have showcased their joint chops for absurdity in films like 'Talladega Nights' and 'Step Brothers,' seem downright reverent of the original, performing without breaking into ridiculousness or parodied lyrics ... until the very end. See the clip after the jump >>