Hey Cenx, I know you've all been trying to make the NPCs more lively, and this is a GREAT idea that I feel could make it into 1.3! It's well done, easy to program(I think) and everyone wants it in! If it could just get the dev team's attention, I think it's a lock!
http://forums.terraria.org/index.php?threads/special-npc-quotes-while-wearing-the-moon-charm-at-night.2263/
http://forums.terraria.org/index.php?threads/special-npc-quotes-while-wearing-the-moon-charm-at-night.2263/