a 17-year old who spontaneously decided to run off for four days survived during his disappearance by eating from the fruit trees at his high school .
connor sullivan , of cupertino , california , attended his first period class at monta vista high school on monday morning before disappearing for roughly 80 hours .
after the junior returned home on his own thursday night , police who had been searching for him learned that the teenager had never left the bay area town and was using the water fountains and porta potty on trees .