"Bono was on fire with lyric and song ideas. His singing had reached a whole other level as if some spirit has entered his body pushing him into uncharted falsetto territory."
- Daniel Lanois on recording Achtung Baby
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".