He was an excellent water boy while he was here. He always made sure the players had fresh cups. He was tough on the players too…..if one of them tried to get a drink before finishing his sprints, Mangini would usually run to Master Bill and try to snitch on the thirsty player.
Belichick later dubbed him “water boy wonder”, and then later “boy genius”. Hearing these praises, the front office of the Jets got excited and hired the enthusiastic water boy. Shortly after the Jets changed his name to Mangenius. The rest is history.