Harry blinked at Ron, shocked at his best friend's statement. He could feel himself growing angrier by the second, and every hair on his body stood on end. Ron just rolled away adn started mumbling idiocies under his breath until finally Harry couldn't stand it any longer.
"Kreacher," he called out very softly, even though anyone looking at the scene would know he was anything but calm. What with the vibrating of the furniture and the way his hair was standing on end.
The old elf appeared suddenly. "Yes, Master Harry?" he asked, looking down at Ron. "Is Master Harry needing a bucket, sir?"
"Yes, that's exactly what I'd like," he said slowly. "Filled with ice cold water." He spoke softly enough that he knew Ron wouldn't hear him. Kreacher popped out and back moments later, a bucket filled with icy water in his hand.
"Thank you Kreacher," Harry said, still calmer than he'd felt in a long time. He took the bucket from Kreacher, and before the Elf could stop him, upended it over Ron's prone form.