Years ago I received a promotion after just a month of starting and one dude started spreading rumors about me to get me fired, claiming he was more deserving of the position since he had been there longer. But he was only there because they were so short staffed that even someone such as himself who'd do a day's worth of work over the course of a week couldn't be fired without screwing up everybody else's schedules. I referred some friends and once they were hired he was out the door. Hit me up on LinkedIn about a month later asking for a reference. There are some serious clowns out there.