A handsome man

A handsome man went into a hotel and asked to see the
boss. When the boss came, the story began.
-The client: is room 39 empty?
-The boss: yes, sir.
-The client: can I book it?
-The boss: of course you can.
-The client: thank you.
Before going to the room, the client asked the boss to
provide him with a black knife, a white thread 39 cm and
an orange 73g.
The boss agreed though he was surprized at the weird
things the client asked to have.
The client went into his room, he didn't ask for food or
anything else.
Unfortunately for the boss, his room was next to room 39.
After midnight, the boss heard strange voices and noise in
that client's room. Voices of wild animals and of utensils
and dishes being thrown on the floor.
The boss didn't sleep that night. He kept thinking and
wondering what might be the source of the noise.
In the morning, when the client handed the keys to the
boss, the latter asked to see the room first.
He went to the room and found everything alright. Nothing
unusual. He even found the thread, the black knife and the
orange on the table.
The client paid the bill and gave the bellboys a very good
tip and left the hotel smiling.
The boss was in a shock but he didn't reveal what he
heard to the bellboys. In fact, he started to doubt himself.
After one year, the client showed up again. He asked to
see the boss again. The boss was in a puzzle.
The client asked the same things: room 39, black knife,
white thread 39cm and an orange 79g.
This time, the boss wanted to know the truth by all means
possible. He spent a sleepless night, waiting for something
to happen. After midnight, the same voices and noises
started, this time louder and more indecipherable than the
year before.
Again, before leaving, the client paid his bill and left a large
tip on the table for the bellboys. The smile didn't leave his
face.
The boss started searching for the meaning of everything
the client asked to have. Why did he ask room 39? why
the white thread? why the black knife??? In fact, the boss
didn't arrive to any convincing answer to all these
questions.
The boss now was eagerly waiting for the month of March,
the month in which the client showed up.
To his surprise, on the first day of March, the same client
showed up. He asked the same questions. Wanted to
book the same room, wanted to have the same things as
before.
The boss again heard the same noises, this time more
louder than before.
In the morning, when the client was leaving the hotel, the
boss apologized politely to the client and asked to know
the secret behind the noises in the room.
-''If I tell you the secret, do you promise to never reveal it
to anyone else?''
-''I promise I will never let anyone know''.
-''Swear''
-''I swear I won't reveal your secret''
So finally, the client revealed his secret to the boss.
Unfortunately, the boss was a sincere person. Uptil now
he hasn't revealed his secret to anyone.
When he does, I will let you know...