Green Day front man Billie Joe Armstrong said the mega-hit "American Idiot" -- which led to the creation of a Broadway musical of the same name -- was inspired by the terror attacks of Sept. 11.
"I remember seeing those planes smashing into the World Trade Center live. Right there," Armstrong said during his appearance on the Broadway stage Friday night with "American Idiot" director Michael Mayer for a talkback session dubbed "Idiot University."
"I don't think we ever really, as a society, we had never seen anything that implicit. It was just chaos. I was so confused.