You know what they say: "dance like no one is watching."
This prank is from the Japanese game show Dokkiri Award (with 'Dokkiri' meaning "to be surprised"). Comedian Toshiaki Kasuga went to work near the base of Mt. Fuji, and after a night of drinking, passed out in the bed of his rental cabin.
Because he was in a drunken stupor, he was able to sleep through the show's prankster crew setting up what would undoubtedly be the rudest awakening in the history of ever.