Hiya, I have only seen 1&2 (they were too scary so couldn't watch the other 2). My scariest bit was at the beginning of 2 when she has to cut they key out of her own eye. My fella has seen all of them and boaks at the needle scene that Daffy is referring to. He can watch any of the rest of the films without a problem, but that scene gts him each time.
They scare the pants off me, and I watched most of 2 from behind my scarf in the cinema, hence I never saw (and have no intention to see) 3 or 4!