10 Best Fan Theories That Totally Change Your Favourite Video Games
3. BioShock Infinite - Everyone Is Everyone
Just as Ken Levine had anticipated when he pictured players reaching the end of BioShock Infinite's story; everyone sat back in their gaming chairs and wondered what the hell had just happened.
The metaphorical minefield represented by all of those lighthouses and Elizabeth's "There's always a lighthouse, there's always a man, there's always a city" speech is exactly the kind of vague, intentionally open-ended revelation that theorists are drawn to.
Liz's words essentially confirm that all of the BioShock games take place in the same universe, and for that very reason, many believe that every character in Infinite is either a parallel of, or identical to, characters that appear in the first game.
Supporters use the sequence where Booker and Liz arrive in Rapture as proof that the theory is actually fact, for the sole reason that Booker is able to activate the city's Bathysphere system - something that only those with Andrew Ryan's blood should be able to do.
That's just the tip of the icerberg; give this a read for a more in-depth comparison.