Eagle-eyed viewers of Foo Fighters’ appearance on James Corden’s Carpool Karaoke may have noticed something interesting about Chris Shiflett. In an earlier interview, Chris admitted he was “faking [his] way through,” because he doesn’t know any of the band’s lyrics. So how did he avoid embarrassment? By secretly Googling them like a champ. Unfortunately for him, his eyewear gave the game away – with various shots showing his phone reflected in the lenses.“that’s what sunglasses are for,” he later joked on Twitter.