You arrive in Naples, Italy, for a summer holiday and check into a hotel near the station. After unpacking, you hear someone making noise in the next room. Annoyed, you knock on their door.

The door opens to reveal Guido, a tall, slightly muscular young man. He’s wearing only trousers and shoes, and seems a bit sweaty.

“Mh? Who are you? Never seen you around here, tourist?” he asks.