Situated halfway up a hill you spy what appears to be the entrance to a cave. Figuring that giving it a look wouldn't hurt anything, you begin to climb toward the rocky orifice. Upon reaching it, you find that it is not only a cave, but one that looks as if it is large enough to explore without worry of stalactite-induced concussions. Though lacking in proper spelunking shoes, you decide that fumbling around in the dark for a while might be fun. With a parting glance around the forest, you slip through the aperture and into the dimness beyond. The interior isn't as dark as you would have expected, and after some minor scrutiny you discover that cracks mar the wall and ceiling in places, providing enough light to make traversing the cave relatively worry-free.
Wandering through the grotto, the limestone walls present a natural beauty which you find quite appealing. Rounding a corner, you are somewhat confused when a metallic glint in the center of the hallway catches your eye. Bending down and scraping at the ground where the glint came from, you manage to unearth an old pocketwatch after a moment of work. Disappointment at not having been the first person to set foot in the cave is quickly replaced by excitement. What if a mere watch is not the extent of what has been lost and forgotten in the cave? Dreams of hijacked stagecoaches filled with gold filling your mind, you drop the watch in your pocket and press on with renewed vigor.
Unfortunately, the cracks which had aided you with their light previously seem to have no siblings in the depths you seek to reach, and your visibility is gradually eaten away by the encroaching darkness. Getting to the point of not being able to see your hand in front of your face, you realize that pressing on has become impossible. Figuring that you'll just have to come back some other day with a flashlight, you turn around and begin walking back the way you believe you came. After several minutes of walking and experiencing no greater level of light, you start to think that you may have taken the wrong path at some point. Now somewhat worried, you fumble about, trying to make out some landmark in the inky blackness.
Without warning, you take a step and find nothing underfoot. Flailing blindly as you pitch forward, you experience several seconds of vertigo before the air is knocked from your lungs by a sudden impact. Managing to get your eyes open for just a second, you think you see something glittering in the darkness ahead of you, but consciousness abandons you before you can even begin to think about what that sparkle portents.