I was fired from a job I was underpaid for and lied to. The manager said I would be given a position as supervisor once I learned the ropes. I not only learnt the ropes in a matter of days, I also improved their archaic systems and had things flowing much better than they ever did. I was also severely mistreated by the current supervisor. I ignored all of it and remained steadfast.

Evenually, due to an error (which happened right after I reported said supervisor for harassment) I was fired. They thought I would be bitter or sad, I laughed my ass off on the way out. Not even 5 minutes later, I called up my old job asked for the position back and was given it.

Edit: The manager who promised me supervisor was fired and the supervisor who harassed me was fired as well. And currently, I received a promotion and now am making more than they did before.