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."