I had been watching Netflix's "Don't Listen", a thriller/horror film focusing on the paranormal phenomena at a certain house in Spain. I noticed the first few patterns about a certain activity, it appears that whenever a certain kind of fly landed on a solid matter (let it be table, dresser, car or even on your ear), it means the ghost is either onto you in order to fuck you up.
Okay, when I saw its pattern, it is obvious that the flies are connected to the paranormal activity - so let's just swap the fly. Nobody did bother to swap the flies in order to sever the connection of ghosts. What a waste. But the film was entertaining to no end.
Cheers,
R-