The first nighttime scene in Su-yeon's bedroom. Her door slowly creaks open of its own accord... she shrinks back in fear... and after a moment of tenseness, a hand suddenly grips around the edge of the door. Gaaaah.
The scene where the wife of the girls' uncle starts having a fit. It is frightening enough the first time around, but, on a re-watch, if one believes the theory that she was being possessed, the scene takes on a very different light.