Once at home, Kyle ran upstairs to his room, passing his younger bratty sister Lisa (8 years old) on the way. She was blabbing something about Kyle being late and how their mom was going to get really upset about it, that Kyle was in big big trouble, but he knew that she was just being bratty again. She'd say anything to try to get their parents to like her more. It didn't always work, but that didn't mean that she didn't try all the time anyway.
He entered his bedroom and started to take off his clothes to put on new ones (his shirt was sweaty and his jeans had grass stains from mowing ... and some other stains from what he did with the Stevens twins). And that's when he heard the stone hitting the floor. It fell out of his pocket.
Only in his underwear and socks, Kyle picked up the stone.