YH is hanging out with Jack Johnson and Jack Gilinsky, AKA viral superheroes Jack & Jack, at SXSW in Austin, Texas! The boys scoop us on their new music ventures, how they come up with their epic Vines, and working with their pal Nash Grier! They also answer some Twitter questions from fans, plus see what happens when a few fans crash the interview and we let them ask the boys a few questions in person!