The idea of an M. Night Shyamalan twist almost overshadows his talent as a filmmaker. When people watch his movies, it is almost a game to see what the reveals are that he hides in his movies. Released in 1999, The Sixth Sense was a wildly successful psychological horror from director Shyamalan. Although it was not the first film he directed, the Bruce Willis-starring blockbuster was his first huge hit and soon led to a career of impressive highs and some critically abhorred lows. However, it also contained a plot twist that no one saw coming.
https://screenrant.com/m-night-shyamalan-movies-twists-explained/