The first rule about "Game of Thrones" is you don't talk about "Game of Thrones," unless you have a theory about everyone's favorite newly trained assassin, Arya Stark.
The last time we saw Stark, she appeared to be leaving the Faceless Men after sparing the life of her target, Lady Crane. Unfortunately, the Waif spotted her and apparently got permission from Jaqen H'ghar to take Arya out. However, a new theory contends things are not what they seem.
Arya ready to have your mind blown?
The theory: Arya and the Waif are the same person.
Redditor catNamedStupidity speculates Arya is suffering from a "Fight Club"-like split personality disorder, pointing out that the Waif doesn't really appear to be seen by people other than Arya and Jaqen. She also seems to magically know everything about Arya, including what she's doing at all times.
Plus, if Arya and the Waif were the same person, it'd explain why everyone in Braavos is cool with someone kicking the crud out of a blind girl in the streets. To them, it'd probably just look like this moment from the show, where the Waif mysteriously disappears during a fight with Arya:
