A security guard gives the last round before closing the museum. In the last corridor, he see an old man looking to a painting.

Guard: Good night sir, I'm afraid that the museum is going to close. We are telling the visitors to go to the exit.

Old Man: Good night, young fella. Do this painting doesn't look a little creepy to you?

Guard: Well... yeah!!! but you know? at night, all the things in the museum look a little bit spooky. Some times I fell a little afraid.

Old man: Don´t tell me that you, a strong and young man is afraid of the dark!!!

Guard: of course not!!!

Old man: Do you believe in ghost, son?

Guard: no, not really...

Old man: I do...

Saying that, the old man started walking slowly in the corridor, dissapearing in the shadow made when the moon light hit an old statue...