Only a handful of bands get into the Rock and Roll Hall of Fame the first year they're eligible these days. When Billie Joe Armstrong learned that Green Day were one of them, he could barely process the news. "I had to go for a walk," he says. "I wound up at this cafe and I sat down and my son met up with me. I told him and he was like, 'Oh my God. No way.' It just took some time to sink in. We're in incredible company and I'm still trying to make sense of this. It's just incredible." The singer spoke to Rolling Stone about the induction's significance and looks back on 25 years of Green Day.