There is surely no movie franchise in existence - save, perhaps, for Star Wars - that's invited as much passionate and downright insane levels of debate as the Marvel Cinematic Universe.
Even a cursory glance online reveals a treasure trove of fan theories about even the most forgettable MCU movies - looking at you, Thor: The Dark World - ranging from the hilariously mundane to the ludicrously grandiose.
Yet fans having their outlandish theories about a superhero movie is one thing, but what about when the creative minds behind these films get in on the fun themselves?
These 10 theories were mostly suggested by the principal creatives involved with each movie - typically the writers and directors - though occasionally the MCU's resident producer himself, Kevin Feige, chimed in to offer his authoritative perspective.
Now, it's important to note that none of these theories are officially 100% canon.
Despite being the "Word of God", most of these filmmakers have stopped short of rubber-stamping their theories for sure, allowing them to ambiguously exist in the background without ever needing formal confirmation on-screen.
That said, don't be surprised if one or two them actually do get referenced in an MCU movie one day.
After all, it was a long-time running gag between fans and Marvel that Stan Lee was playing the same character across his countless cameo appearances, and Guardians of the Galaxy Vol. 2 finally made it canon in the most brilliantly crowd-pleasing way possible. Never say never...