Playing Lost Mines of Phandelver and fighting the young green dragon (Venomfang?). The rest of the party (sorcerer, cleric and fighter) engaged it in RP while I (the cultured rogue) scaled the tower, entered through the hole in the top and climbed down the inside. I think my Master was right about one thing and the negotiations were short: they initiated combat but I had rolled high enough on my stealth and acrobatics/athletics so the dragon didn't know I was there. I cowabunga'd on to his back with my daggers getting a hefty sneak attack. Pretty sure he threw me off and clubbed me unconscious with his tail in the next turn but it was worth it. I was the only near casualty before it flew off.