And the soundtrack is/was ridiculous. Who else gets chills when they hear it even today? It remains the only movie that I have ever watched that kept me awake for several nights afterwards.
Yeah that piano part is fucking creepy as all hell. It just tenses you up listening to it.
One movie that kept me up for nights the first time I watched it was 28 Days Later when it first came out. I had nightmares for days after that. Soundtrack for that was great as well. Especially that scene where he walks around in a abandoned London and East Hastings starts to play.