You're gonna probably laugh at this but probably the most scared I've ever been of a movie was watching the Blair Witch Project opening night in the movie theater....then driving 45 minutes after that was over into the boonies to stay at a buddies house.
We get to his house it's pitch black, I step out of the truck and the dome light shines on the gravel driveway where I can see all these neat little piles of rocks just like in the movie. Needless to say I kicked them bitches over and straight up ran like my ass was on fire to his front door and so did he.
The next day we find out his step brother was just making piles of rocks in the driveway to drive his Tonka trucks on.
In hindsight it was silly, but I've never been so terrified.