Welch talked about making the song in the liner notes: "'Flush' was actually created accidentally. Well, sort of... In the summer of 2005 I went through this crazy writing streak where I wrote almost forty songs in forty days. Whether they are all good or not is a matter of opinion, but that's when 'Flush' was birthed. I was about ten days into the forty day writing streak when I just got finished writing a song called 'Save Me From Myself.' I really wanted to go home after working all day on the song but I realized I lost my studio key and I locked myself in the studio. While I was waiting for my friend to bring the key, I started thinking about how crazy it was that all the music was flowing out of me, then suddenly I had a thought, 'I'm gonna go back inside, grab my keyboard, and whatever my hands do, I'll make a song out of it.' I knew it sounded crazy, but since I was having so much success writing songs, I wanted to see if that approach would stop the creative juices from flowing. It didn't. I remember saying out loud, 'God, give me a crazy riff.' When my hands hit the keyboard, I immediately played the opening riff for 'Flush.' It was thick and groovin and I loved it! I wrote it on a keyboard, but I knew it would sound big and beefy when I put the huge distorted guitars on it. After I recorded the idea, I just shook my head and laughed because I wrote such a cool riff without even trying."
Keegan - Madison, WI, for above 2