Hearing Voices

 is a Fallout 3 quest that is added to the game with the Point Lookout add-on.

Reward
SCAR hair style*, 300 XP, and access to the Ark & Dove Cathedral(with access to all the punga fruit you need)

* note that once you talk to Nadine about removing the SCAR hair style, you decision is FINAL, unless you save your game right before you remove it you cannot get the style back.