West contributes a second verse to the track, before Perry's final refrain, with heavily auto-tuned vocals: "I know a bar out in Mars / Where they driving spaceships instead of cars".[21][28] He finishes with a reference to the fictional animated character Shrek and lyrics about "alien sex": "Imma disrobe you then imma probe you / See, I abducted you so I tell you what to do."[25]