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 . It was briefly called Bad Finger Boogie ( later the inspiration for the band name Badfinger ) , supposedly 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 .