From 1997-1999, Bill Belichick worked as an assistant coach and defensive coordinator for the New York Jets under Bill Parcells. Prior to calling it quits, Parcells worked out a deal that would make Belichick the team's next head coach. The plan worked to perfection...for one day. That's because after only 24 hours as head coach of the Jets, Belichick got a change of heart and left in the most cold-blooded ways to ever leave a franchise.
On a sheet of paper, BB wrote "I resign as HC of the NYJ" and then used his introductory press conference to tell the media that he was resigning, citing "various uncertainties surrounding my position as it relates to the new ownership." Soon after, Belichick became the head coach of the New England Patriots. Jets fans called him an SOB but let's be honest, the guy just came to his senses.