[LennonCook]

Originally posted by Neb: Probably because some of the scary part of thrillers are the characters' thoughts. Their fear.... You can really feel how the characters feel when you have their feelings described to you like that. In movies the only thing that can scare you is the "shock" effect where something suddenly bursts forth from somewhere or such....

I agree entirely. No movie can ever capture the same depth as a book. If youve read a thriller, then see the movie, it is never good, and more often than not quite stupid.
And it will often happen with other genre aswell. For example, most Roald Dahl books have been turned into movies. Some have the only similarity as the title.
Movies are *never* as good as books.