RS is my son's friend; he's 12...so go easy on him. Let me fill in the rest (I think he was posting that as though speaking to me).
He and my son play rogues...teenage brothers. Born and bred in the largest city in my campaign world, and have no experience in the wilderness. So, on their first wilderness adventure, they end up fighting a dire badger. After defeating it, they come to a narrow canyon, and as teenage boys are wont to do, began arguing about things. It never occurred to them the canyon might create echoes. The echoes of their argument not only gave away their position to the goblins they were tracking, but masked the approach of the goblins, as well, catching the players off guard when they attacked.
What reallly makes this funnier is that they weren't just roleplaying their characters, they were actually arguing with each other about who did what and who screwed up during the badger fight. I just incoporated the argument into the game, and it worked out for a great encounter and combat scene.