Jack Black on 'SNL' skit written by Amy Poehler, Emily Spivey: 'Really rockin'

Jack Black opens up about a SNL' skit written by Amy Poehler and Emily SpiveyJack Black finally shared the details of an unaired Saturday Night Live skit written by Amy Poehler and Emily Spivey.The 56-year-old American actor and comedian appeared on Late Night with Seth Meyers on Tuesday, December...