Challenge 127

The dismissal of the night guard

Difficulty level:

A big businessman, needing to go to Sao Paulo, came to his night guard and ordered him to wake him at 6 am sharp. At exactly 6 am, the guard woke up the businessman and said:

"Boss, I have a bad feeling. I dreamed tonight that you would have a plane crash. Let me suggest you not travel."

The businessman did not listen to the guard. Without incident, he arrived in Sao Paulo and over the phone had the guard dismissed. Why?