What is the mysterious stranger doing in my vault?

This morning after the new Fallout Shelter update (1.2), I saw a mysterious stranger hiding in one of my rooms. When he is tapped there is a sound cue and he disappears in a puff of black vapor.
Does anyone know what's going on here?
Best Answer
The mysterious stranger will give you 250 caps if you can tap him before he disappears. He does not appear to take part in combat.
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What does the mysterious man do in Fallout Shelter?
The Mysterious Stranger spawns either on top of the enemy or within touching distance and won't fire his shot. He continues doing this and resetting the game doesn't fix it, effectively making him useless.How do you know the Mysterious Stranger is in your vault?
There is an easy way to find the Mysterious Stranger in Fallout Shelter, and it involves using sound. When he appears, a faint piano sound is made, so that's your queue to scour your Vault for the trenchcoat-clad intruder. Don't worry if you miss him, because he appears every few minutes.How long do you have to find the Mysterious Stranger in Fallout Shelter?
Once you've heard the sound effect though, you'll have roughly 7-10 seconds to locate him within your vault, if you failed to find him you'll hear another piano tone play and he'll disappear. Fear not though, he tends to re-appear every few minutes.Who is the mysterious figure in Fallout Shelter?
Background. These mysterious figures are figments of the Survivor's memories, representing Conrad Kellogg and two Institute agents responsible for kidnapping Shaun.Fallout Shelter v. 1.6.1 - How to Find Mysterious Stranger
More answers regarding what is the mysterious stranger doing in my vault?
Answer 2
As an addition to other answers.
The important thing about the piano sound is that it is coming from Stranger's location and when playing with headphones and zoomed in at the moment, it is not so difficult to determine the direction and the distance, especially after getting used to it.
Answer 3
The mysterious stranger is a reference to the perk from Fallout 3. Saw him also first time I played after update. Wish he would have hung around little longer though - barely noticed him. Hopefully he shows up next time those f'ng deathclaws do..
Answer 4
He gives cap rewards, but is the amount of caps based on level or is it how long you take to tap him, or maybe even the room he's in at that moment, or EVEN if your I combat or not... So many questions (also what triggers him to enter your vault)
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