I cant remeber the scary bit, oh wait it might be the white drug dude busitng the door open as it cuts to it form a peaceful scene.
The film really does keep yoiu guessing, pay attention to everything the old guy says as the ending brings it all together and it makes perfect sense.
I could ruin the whole film for you and number 1 even though I didnt see the frs tone by the end of this film you can work backwards and realise what the old man and girls role was i nthe first film.
Its worth a watch, its got lots of violence but then there are some scenes that make you want to throw up, I closed my eyes for one scene part way through then onpened them again, I needed a few secs break.
The bit I refer to is the trapped hands in that glass box.