What drives our thoughts?

I was thinking to my self what drives our motives in a legitimate story? In movies for example, specially those claiming to have a true story behind it, such Texas Chainsaw Massacre. What if it is just a hoax? This story bought so many to believe that a madman was loose with a chainsaw, killing people mercifully. Do not get me wrong the story was incredible, and still deemed to be true. I just think its so awesome, how movie makers, specially directors try so hard to get people into the scene and make us think about random things, for example in Texas Chainsaw Massacre, after I saw it, I was shaking at night, thinking leather face would pop out, and slice me in two. Movies intrigue us with their complex, interesting, and interactive, storylines, which just amazes me, because it drives people to think way way out of the box.