Lennon and McCartney finished writing this song in mid-March 1967, written as Starr's song for the album. It was briefly called "Bad Finger Boogie" (later the inspiration for the band name Badfinger), because Lennon composed the melody on a piano using his middle finger after having hurt his forefinger; but in his 1980 "Playboy" interview Lennon said: "This is Paul, with a little help from me. 'What do you see when you turn out the light/ I can't tell you, but I know it's mine...' is mine."