Gollum

"He wandered in loneliness, weeping a little for the hardness of the world, and he journeyed up the River, till he came to a stream that flowed down from the mountains, and he went that way. He caught fish in deep pools with invisible fingers and ate them raw. One day it was very hot, and as he was bending over a pool, he felt a burning on the back of his head, and a dazzling light from the water pained his wet eyes. He wondered at it, for he had almost forgotten about the Sun. Then for the last time he looked up and shook his fist at her.
But as he lowered his eyes, he saw far above the tops of the Misty Mountains, out of which the stream came. And he thought suddenly, “It would be cool and shady under those mountains. The Sun could not watch me there. The roots of those mountains must be roots indeed; there must be great secrets buried there which have not been discovered since the beginning.”
So he journeyed by night up into the highlands, and he found a little cave out of which the dark stream ran; and he wormed his way like a maggot into the heart of the hills, and vanished out of all knowledge..."

LotR: The Shadow of the Past