Fallout 4 Random Encounters

While traveling through the many landmarks of The Commonwealth, the Sole Survivor can experience some random encounters.

Deathclaw Brawl
There is a chance that two Deathclaws will spawn and begin fighting one another until one of their health runs low and the losing Deathclaw retreats. Be careful, because, once the fight ends, both Deathclaws will turn hostile and attack.

Two Faces. One Synth
The Sole Survivor can come across two men, identical in appearance and both named Art. One Art is a human and the other is an identical synth. One Art has the other on his knees and is preparing to execute him with a shotgun. Both Arts will claim to be the real one and state the other is an Institute synth sent to kill the other and take their place. If the Sole Survivor decides not to interfere, the human Art will execute the synth and walk away. A very difficult speech check can convince the kneeling Art to admit to being a synth, at which point he will encourage the sole survivor to assist him in killing the real Art. A simple speech check can convince the standing Art to lower his weapon, at which point the kneeling Art will draw a weapon and attack him. Alternatively, the sole survivor can simply attack one of the Arts. The Synth Art will have a Synth component on their body, indicating whether or not the player has chosen correctly. If the standoff is interrupted the two Arts will begin start shooting at each other, turning the event into a normal combat.

Preston Garvey Impersonator
While wandering, the sole survivor may come across a smooth talking man claiming to be Preston Garvey. He will request a donation of 100 caps for the Minutemen. If the sole survivor tells the imposter that he knows Preston, or that he is the general of the Minutemen, the impersonator will run away.

A Girl and Her Robot
"You stumble upon child merchant Kat and her Sentry Bot Gus; you can trade if you want."

While wandering, the sole survivor may come across a little girl, Kat, and her Sentry Bot guardian, Gus. This encounter is possibly a reference to the Little Sisters and their protectors the Big Daddies from the Bioshock series. As of patch 1.1.30 Beta, Kat cannot be spoken to.

Malfunctioning Robots
The Sole Survivor can sometimes happen across a few Assaultrons spouting random nonsense. Upon noticing the Sole Survivor, they will all charge, screaming "WHAT A PRETTY BOY". This is possibly a reference to the 1952 movie At Sword's Point, where the same line is flung at a woman dressed as a man before she is challenged to a sword duel.

Feral Ghoul Family
The Sole Survivor can sometimes stumble across a pack of named feral ghouls. Their names are Mr. Donoghue, Mrs. Donoghue, Mr. Sumner, Mrs. Sumner, Mr. Parker, Mrs. Parker, and Ms. Rosa. These are all the names of sole survivor's neighbors in pre-war Sanctuary Hills.

The Farmer and The Vicious Dogs
Occasionally the Sole Survivor will come across a farmer being attacked by three dogs. If the Sole Survivor kills the dogs in time to save the farmer, he will reward the Sole Survivor with 250 caps. This encounter can occur multiple times.

Wounded Dog
The Sole Survivor can come upon an unmoving, non-hostile mongrel. If spoken to, the Sole Survivor can tend to its wounds, then give it a name. It will not follow the player, nor can it be sent to a settlement, and it will disappear once the player leaves the area. It will however help fight any enemies that approach it.

Duke
A member of the Atom Cats wearing a full suit of power armor, scouring a wrecked car for parts. If spoken to he will helpfully mark the Atom Cats garage on the Sole Survivor's map, then walk off.

Absalom
A hostile sniper wearing full combat armor, he will attack anyone he comes across, including the player, similar to Sam Warrick from Fallout 3.

Gene and his Dog
While traversing the wasteland you may encounter a man named Gene. He will ask if you want to buy his dog for 250 caps but then is hesitant. Convince him with 6+ charisma to buy the dog then it can be sent to a settlement, granting that settlement +5 to Defense. Gene can be encountered multiple times, and a new dog can be purchased from him each time.

Kelly and her Brahmin
A woman named Kelly can be found traveling the wasteland with a Brahmin. She will offer to sell the Brahmin to you for 100 caps. It can be sent to a settlement to improve the efficiency of farming at that settlement. If asked whether the Brahmin is stolen, Kelly will become evasive, with her tone ambiguous as to whether she's feeling guilty or merely thinks it's a stupid question.

Advertising Eyebot
While wondering the commonwealth the Sole Survivor may come across a eye bot who advertises Cambridge Polymer Labs. If investigated, this opens up a quest where the player is trapped.