OK, here it goes.
Back in the early-80's, my mother was on vacation in Sicily to visit relatives.
Late one night, as she laid in bed, writing a letter to my dad on the second floor of my grandmother's house, she looked up and noticed that the window curtains were rustling by themselves, even though the windows were closed.
A moment later, she witnessed an imposing figure appear: a tall, blonde man, dressed in a World War II military uniform. He had a cold, blank look on his pallid face, and slowly started approaching her, with his arms stretched out.
My mother suddenly froze with fear, and clenched her fists very tightly. The moment she did this, the apparition started to walk backwards, until it finally vanished behind the curtains.
The next morning, my mom went across the street to stop by and say hello to an elderly couple, whom she knew since childhood.
The old woman prepared some espresso, and they all talked, as they usually did. My mother did not mention the ghostly encounter she'd had the previous night, and intended to keep it a secret from everyone except my dad.
But, at one point in the conversation, the husband of the elderly woman asked my mother: "By the way, did you get a strange visitor last night? My wife and I were up past our bedtime, arguing with a mysterious soldier who somehow entered our house. He spoke a language that we didn't understand. It sounded like German or English. We tried to get rid of him, but he refused to leave. We finally convinced him to go by directing him to visit you. We figured that, since you speak English, perhaps you could understand what he is saying".