Songfacts®:

• This early Green Day song holds special meaning to their frontman Billie Joe Armstrong, who wrote it when he was 18. He says it's when "I really found my rhythm as a songwriter."
  
  "I'd just dropped out of high school, and I was feeling really lost - like a daydreamer who was being left behind," he told Rolling Stone. "I didn't know what life was going to be. I think that's when I'm at my most honest as a songwriter, when I'm feeling lost. So I took this sad feeling and turned it into something that felt more empowering:
  
  My interests are longing to break through these chains
  These chains that control my future's aims
  
  My songs were about infatuation up until that point. This one felt like a different version of who I am. I remember when we first started playing it, people were really receptive to it, especially the punks that were on the scene at the time."
• The title doesn't show up in the lyric, but we know the band is big on coffee: Billie Joe Armstrong and Mike Dirnt set up their own coffee company, Oakland Coffee Works, in 2015.
  
  As for 409, that could be a reference to the Beach Boys song.
• Green Day issued the song on their Slappy EP, which came between their first and second albums. It was later combined with their EP 1,000 Hours and released as the album 1,039/Smoothed Out Slappy Hours.