Ringo Starr coined the phrase "It's been a hard day's night" after a long day of work. He realized it was night while still feeling like it was day. This spontaneous remark occurred during a filming session, and it humorously captured the hectic lifestyle of the Beatles.
April 15, 1964…After a long day of filming for their first movie, which was still called "Beatlemania!," Ringo Starr declared that it had been "a hard day's night." John Lennon immediately began writing the song of that name on the back of an old greeting card.