The Preacher

 (simply called wastelander ingame) is an inhabitant of Washington, DC's Seward Square district in 2277.

Background
The Preacher is standing on the second floor of a building in an alleyway west of the Reilly's Rangers headquarters entrance on Seward Square. The alley has been rigged with mines and mini nukes that he detonates if you try to get close to him. There is a hostage (another wastelander) on one end of the alley, who you can talk to. If you are looking at the Preacher when he detonates, he waves at you. He preaches mad logic to anyone that can hear him. He rants about the apocalypse, the sun, and an evil worm that he plans to blow up.

Effects of player actions

 * You can talk to the hostage and, with a charisma check, convince him to confront the preacher. Doing so will result in the detonation of the mines and mini nukes. This will result in the Preacher's death as well as the hostage.
 * Speaking to the hostage once the Preacher is dead (assuming you killed him before he could set off the explosion event) will result in no dialogue options but the Hostage will comment on how quiet it is now. There is no way to "release" the hostage.

Notable quotes

 * "Not one step further! Not one! Come no closer! I'll do it! I'll blow us all to hell! All of us! Me, you... and the worm..."
 * "You don't know, you can't know. Little fools. You wish you knew! You wish! But only I know! Only me... only me... only me..."
 * "In fourteen-hundred and ninety-two, your mother and my mother were hanging up clothes around the mulberry bush."
 * "And the sun will rise in the north! No, the northwest! For forty-four days and sixty-seven nights! And we'll never notice!"
 * "Try new Blammo, soap! Blasts stains out. Blasts the whole world out. We've all been BLAMMO'D."
 * "Hungry, hungry, hungry so hungry... what, no I'm not hungry, the worm is hungry. Hungry for me, hungry for you, and for fire."
 * "Beware worm, I shall destroy you with the fire of this small sun before me. BEWARE WORM!"
 * "A great crack shall open in the earth and swallow the nonbelievers! And they shall weep, weep, weep! Tears of salt and earth and dirt!"
 * "The sun! It burns! Why does it burn!? Why did we put the sun into a jar? And what did we do with that jar? We broke it all over our little world."
 * "Trees! So many trees! To the north! But be careful... the trees... are deadly, and the trees too will be consumed in the belly of the great fat worm!" ("...trees! To the north!" is actually a reference to Oasis.)

Appearances
appears only in Fallout 3.

Bugs

 * The Preacher may blow himself up even if you are blocks away and you have not seen him. You can tell when you see a massive explosion a few blocks down.
 * The player may find the Preacher dead and the hostage missing, but all of the explosives still in place.
 * The Preacher will finish his sentence even after you kill him.