A wealthy man had an important flight the next day. Early that morning his security guard tells the man not to take the plane because he just had a dream that the plane would crash. The security guard then leaves as it is the end of his shift.
The wealthy man took the advice of his security guard and traveled by train instead. Once he arrives at his destination, he learns the plane did in fact crash. He then fires his security guard.
Why did he fire the security guard?