Movie and sound that I would use

At the begining, I planned to use around 10 movies in my mashup. 

They are paranormal activity 3, sinister, poltergiest, one missed call, the sixth sense and woman in black.

However, when I work on it, 

I lessen it down to 4 movies and the most I use will be last summer and silent hill which they are the main character / main story in my mashup. 

insidious trailer

Silent Hill: Revelation 3D - Official Trailer (HD)

Long Weekend trailer

A Nightmare on Elm Street Official Trailer #1 - (2010) HD

In terms of sound effects, I would also use some audio and background sound effectsfrom youtube video and also music or song from movies. 

For example I would use one of the song from a nightmare on elm street which I got from youtube video. 

Latest Nightmare On Elm Street One Two Freddy's Coming for you

creepy girl talking

Then I would use a small part in "creepy girl talking" video in my mashup which is the middle part when she singing herself. 

I think it's quite scary if I add on echo and this is absolutely match with my video. 

References

joblomovienetwork. (2012). Youtube. Silent Hill: Revelation 3D - Official Trailer (HD).
<Available at : http://www.youtube.com/watch?v=GNpHVlomFD8>

e.com/watcMovieclips. (2011). Youtube. A Nightmare on Elm Street Official Trailer #1 - (2010) HD.<Available at : http://www.youtube.com/watch?v=ZuYoEtEI_go>

SmlFries. (2010). Youtube. Latest Nightmare On Elm Street One Two Freddy's Coming for you.

<Available at : http://www.youtube.com/watch?v=T5aTstxguBY>

Engel, S., (2010). Youtube. creepy girl talking.

<Available at : http://www.youtube.com/watch?v=lJarvZMi0gU>