The admission came after observers noted Flea and his bandmates weren't plugged in while performing Sunday at MetLife Stadium in East Rutherford, New Jersey. Flea wrote on the band's website that the opportunity was too big for the lifelong football fans to turn down. After internal debate, dubiously checking with fellow musicians and consulting with headliner Bruno Mars, they decided it was "a surreal-like, once in a life time crazy thing to do and we would just have fun and do it."