This was U2's first single released on Island Records and their first single released outside of Ireland. They toured England to support it.
The title came from a note Bono's friend Gavin Friday (from The Virgin Prunes) left on his door when he came to visit and Bono was not home.
This was voted Best Single in 1980 Hot Press Magazine reader's poll.
The Edge ran his guitar through a cheap echo unit he bought.
This is the only U2 song produced by Martin Hannett, who also worked with Joy Division.
This was inspired by the fragmented punk scene Bono saw when they opened a show in 1979 for The Talking Heads and Orchestral Maneuvers In The Dark.
The only album this appears on is the live Under A Blood Red Sky. It was the only track taken from a performance at The Orpheum in Boston on May 6, 1983.
Bono was inspired after watching an atmospheric performance by the rockabilly/punk band The Cramps. "This was the peak of Goth and the gig was filled with candles," he recalls in the book U2 by U2. "Voodoo was the order of the day, there was the atmosphere of Black Mass, and I was thinking it was the night of the tragically hip. There was a lostness in the looks on their faces. It was that sepulchral make-up, white face, dark eyes, stuff my mates in the Virgin Prunes were up to their painted eyebrows in. But it felt like the end of the world. To a very young boy, nineteen years old, from the suburbs of Dublin, it seemed there was no life here at all. There might have been more humor than I was capable of spotting at the time."