After finishing the "A Refreshing Rescue" Quest, Bottle & Cappy started visiting my Vault.
What are their effects, other than the happiness boost? And how does the happiness boost behave?

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4 Answers

Bottle & Cappy temporarily increase the happiness of all the Vault's Dwellers by 20%, for the duration of their visit. Also, tapping on them while doing a cheer-up activity will give you Caps. It might also happen to earn Nuka-Cola Quantum from Bottle.Earning Caps and Nuka-Cola Quantum from visitors

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I found that yes, they attract incidents but they also boost happiness. Both will drop rewards when you tap on them while they dance. Bottle will give you 1, 3, or 5, nuca-colas depending on when you tap on her/him (it?). Cappy will give you caps, also depending on when you tap him/her (it?). I found that the longer you let them dance the higher your rewards are.

I have noticed that Bottle only dances once, and Cappy can perform up to like, 4 times before they leave. Also, yes, they do attract deathclaws. Almost makes me wish they would stop visiting, if you can even turn that off.

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In my experience, this is what they do: ~Increase Happiness ~Clicking on Cappy as he performs each time gives you caps ~Clicking on Bottle the one time he performs gives you between 1-3 nuka-colas or caps