Negligent guard

A security guard has a dream that the jet plane his boss is supposed to take the next day is going to crash. When he wakes up, he calls his boss at home and tells him. His boss listens to him and decides not to take the plane.

The next day, the plane crashes. The boss calls the security guard to his office and gives him a reward and then fires him.

He asks his boss why he’s being let go. The boss replies, “You were sleeping on the job.”