Alrighty my fellow OS Nexians!

Surely you've heard of this game series.

If not, Five Nights at Freddy's is a series of three games (currently) where you must survive a series of nights as a security guard being hunted by well... these things:

'Living' animatronics.
And they get scary.

I've became obsessed after watching this guy's play through:

It's not so much the game itself, but the massive hidden lore inside that fascinates fans, like myself.
So let's discuss.

Who else loves the series of games, and what theories do you know/believe about its story?

What could possibly go wrong?