 " Monster " has been described as brooding , disturbing , creepy and the " weirdest A @-@ list event @-@ rap posse cut in recent memory . " The song begins with an ominous , distorted vocal roar , sung by Justin Vernon of Bon Iver , with Vernon declaring " I shoot the lights out " , which sets up the dark atmosphere of the track . The intro of the song is followed by a brief verse given by Ross , delivered in the rapping style of boom bap . In a deep voice , Ross asserts the lines " bitch , I 'm a monster , no good bloodsucker , fat motherfucker , now look who 's in trouble , " over the eerie production featured during the beginning . Following the introduction by Ross , West then provides the song 's hook , singing " everybody know / I 'm a motherfuckin ' monster " in a heavily distorted manner . West then launches into a full verse . Chicago Sun @-@ Times writer Thomas Conner stated that West rhymes “ esophagus ” with “ sarcophagus ” , commenting that it was surely a hip @-@ hop first . 
