"We spent 10 minutes writing this next song, 10 minutes recording it, 10 minutes mixing it, 10 minutes playing it back and that has nothing to do with why it's called '40'."
- Bono, 1987, introducing the song '40'
did you know
The lyric "3:33 when the numbers fell off the clock face" from Unknown Caller is a reference to the Bible verse Jeremiah 33:3. Bono refers to it as "God's phone number".