Great Mighty Poo

The Great Mighty Poo is a disgusting but oddly musical monster and a boss from Conker's Bad Fur Day, it is quite literally a colossal living pile of sewage and inhabits an equally grotesque realm - for reasons unknown this vile creatures takes an instant dislike to our misfortune squirrel protagonist and goes into a musical rampage in which it sings (with some very colorful language) while hurling bits of itself as Conker in an attempt to kill him: eventually the Great Mighty Poo is defeated and Conker can progress - needless to say the Great Mighty Poo is seen by many as one of the most unique (and bizarre) boss battles in the game.