The Amazing Aqua Cura!

 is a Fallout 3 quest that is added to the game in the Broken Steel downloadable content pack.

Walkthrough
This quest can be started by hacking Scribe Bigsley's computer and looking through the logs, or by talking to Griffon himself in the Museum of History. Griffon, a ghoul outside of the Underworld, is selling Aqua Cura that is radiated, but he says it isn't and it will cure being a ghoul. If you keep talking to him you will eventually need to talk to Scribe Bigsley. He will tell you that Griffon's operation is in the Museum Authority Building. When you first enter the building go to the very back and find a stair way going downstairs. When you go downstairs take a right into a big room with barrels and tubs. In between 2 tubs on a coffee table are 2 Dirty Water, a Nuka-Cola, a Clipboard, and a Holotape. The holotape tells you that Griffon's Ghoul Guards dump the Aqua Pura into the tubs and sinks, making them radiated. When you go confront Griffon you can either tell him to pay you 300 caps or caps every week, tell him to tell to tell his audience to say it's radiated or you tell them, or tell him you won't expose him if he sells real Aqua Pura for now on.

Forcing Griffon to confess
If you force Griffon to confess about the true nature of Aqua Cura, the crowd will turn hostile against him. Griffon will attempt to defend himself, but ultimately runs away and hides in one of the bathrooms at the entrance of the Museum of History. The crowd will follow him into the bathroom where Griffon will make a final stand but eventually is killed by the angry mob. Griffon's body can then be looted for ammo, 200 caps, a Chinese Pistol, Dirty Pre-War Businesswear, and a Wig.