New boss was not willing to pay for the hard work of this IT guy as promised by the Great Boss. So the IT guy took his revenge by managing to get the New Boss's henchman to sign on a two-week vacation and the resignation letter. In the end, the IT guy got what was his while the New Boss regretted.
IT guy wrote the code which took him a week, went to the New Boss who was impressed with his smart work. When asked for the payment as promised by the Great Boss, who was forced to retire recently, the New Boss declined and offered him for two vacation days. The IT guy, of course, denied the offer and took his revenge perfectly. In the end, he got what was his and left the job with the source code with him.