paranormal activity

I've just watch this creepy movie about a paranormal activity inside a lovely house. the cause of this paranormal activity was a vengeful spirit. the story was a moving couple to their new house. further that they notice, their house was haunted with a spirit in it. many strange this have happen. the most terrifying one was the mother of a little baby been graded down towards the stairs by an invisible force. i say paranormal activity 2 was an amazing and surprising  horror film