Insidious

[postlink]https://wayangjom.blogspot.com/2011/05/insidious.html[/postlink] http://www.youtube.com/watch?v=E1YbOMDI59kendofvid [starttext] "Insidious" is the terrifying story of a family who shortly after moving discover that dark spirits have possessed their home and that their son has inexplicably fallen into a coma. Trying to escape the haunting and save their son, they move again only to realize that it was not their house that was haunted.
Reference from dictionary, INSIDIOUS means Proceeding in a gradual, subtle way, but with harmful effects.