Ron's thoughts while moving the boulders aside during CoS:
Dust was everywhere, coating his hands, stinging his eyes and mingling with the sweat, and still he shoved on. By now his bright red hair probably looked more gray then his Uncle Bilius' had, but that didn't cross his mind until much later. He'd started with some of the smaller one's, brushing them aside and testing to see how they fell before judging on if he even could move the larger boulders.
His hands slipped, and he smashed face first into a particularly jagged one, probably causing a cut where his eyebrow still stung, and still he kept working at it, the only thought on his mind now to get through. Harry was on the other side, going after his sister. He just had to get to her, help his best friend. The thought of turning back would never cross his mind until he knew for absolute certain where they were. He'd take on the Heir of Slytherin himself with his bare hands if it came down to it.
Fingers nearly scraped raw, ignoring the shuttering of his lungs as he shoved and pulled to get yet another boulder out of the way, he considered taking a break just for some air. Was he losing his oxygen at this end? Didn't matter, the image of Ginny at breakfast that morning made him keep going, how worried she'd clearly been, how he'd done nothing to help her.
Finally, something gave way, and he had to duck to the side as a hole crumbled just large enough for him to shove his arm through. He grinned with satisfaction, ignoring the mingled taste of sweat, dust, and blood leaking into his mouth as he brushed that aside to get a good look. He was confident now he could wiggle himself through that, he would even if he had to dislocate his bloody shoulder to do it, when he heard the best noise in the world. Harry was coming forward, Ginny in tow.