It’s a common rule of monster movies, the kind aiming for genuine scares. Don’t show your monster too much, or it stops being scary. Details the imagination can provide are far more terrifying than even the most elaborate makeup or FX. Nothing is scarier, either in the movies or in real life, than being alone, far from help, staring into the impenetrable darkness and knowing that SOMETHING is lurking out there, something that you cannot see but can see you, is watching you, and is waiting. For what? For you to fall asleep, perhaps, or just let your guard down.
Cavemen huddled together around campfires, staring into the night, seeing the eyes of predators gleaming back at them, hungry beasts that would, if not for the fire, which they feared, charge in and drag the helpless humans off to devour them. Modern society has mostly cleared the woodlands of such animals. Sabertooths and Dire Wolves are extinct; Cave Bears and Marsupial Lions are no more. But do things yet dwell in the darkest, most remote locales, things hostile to us, things that HUNT us? Read this linked account of an avid outdoorsman who became terrified of SOMETHING unseen in the darkness, but the presence of which he sensed. If true, it’s a safe bet he believes, now, in such things. Do you?