Songfacts®:

• Boredom, antisocial behavior, and masturbation are some of the themes of Green Day's Dookie album. "All By Myself" checks all these boxes, telling the story of a guy who go into a girl's room and spend some quality time all by himself. It's a Tré Cool solo track: The Green Day drummer wrote the song, sang it, and played the acoustic guitar.
• This is a hidden track on the Dookie CD, popping on about a minute after the last listed track, "F.O.D." There is only about 37 minutes of music on the album, so there was plenty of room to include "All By Myself." It's a loony little song with little production value, so setting it apart as a hidden track made sense.
  
  Hidden tracks were a casualty of the digital age: When Dookie was made available for download and streaming, "All By Myself" was visible on the tracklist.
• Green Day played this live from time to time, with Tré Cool switching places with frontman Billie Joe Armstrong, who would man the drum kit.
• When Rolling Stone got Billie Joe Armstrong and Billie Eilish in the same room for a 2019 sit-down, Eilish said "All By Myself" was her favorite Green Day song. "That's a dirty little song," Armstrong replied.
  
  Eilish didn't discover the song by letting the CD play through to the hidden track - she never owned a CD.