Warning: by Green Day

"Warning" is a song by the American rock band Green Day. It is the second single and title track from their sixth album of the same name. Billie Joe Armstrong has said that the original concept was to create a song whose lyrics were made up of all signs and labels, and the idea grew from there.The song was a number three modern rock hit in the US. The song also made it into the Top 40 of the UK Singles Chart in the UK. It has been noted that the song's main guitar riff bears strong resemblance to The Kinks song "Picture Book".This is the first Green Day song to feature a tremolo effect on the guitar; an effect used prominently in the 2004 single Boulevard of Broken Dreams.