6. Frozen is a prequel to Tarzan
Pixar seems like it might have a wider universe thing going on, but Disney's storied animated features are all pretty self-contained. As much as we might want them to, Bianca from the Rescuers and Gus-Gus from Cinderella are never hooking up. Part of the reason for the lack of Pixaresque links in Disney films is simply because movies like Aladdin and Sleeping Beauty were made before the internet was widley used, and also before nerds had access to freeze-frame on DVD.
The rules of Disney's multiverse only changed recently, most notably evidenced by the characters from Tangled briefly showing up in Frozen. That particular easter egg led fans down a deep rabbit hole, which somehow ended up connecting Frozen with the 1999 favorite Tarzan.
It all begins with a doomed voyage across the sea.
Towards the beginning of Frozen, we see Anna and Elsa's parents sail away on a ship that is soon consumed by a sea storm. We and everyone in the movie assume that mom and dad have gone the way of Batman's parents, but what if they survived and were stuck on an island? No one would have any way of knowing they were there. It's not such a crazy proposition, because that's exactly how Tarzan starts -- with a shipwrecked couple surviving by themselves in the wild. If Tangled and Frozen can be in the same universe, it would make sense that Anna and Elsa's parents are the same unlucky souls that find themselves marooned at the start of Tarzan. This would also imply that Tarzan is the baby brother of both Anna and Elsa.
Stubborn fans have found plenty of flaws in this theory. The couples don't look exactly alike, especially in eye color. And there's the matter of their clothing, which seems to come from two different time periods. Then again, these are the same movies that include talking gorillas and magical ice powers, so those kinds of plot holes seem kind of minor.
The part that really sealed the deal for this fan theory came during a Reddit AMA, in which Frozen directors Chris Buck and Jennifer Lee seem to confirm our suspicions. When probed about it recently, Buck doubled-down on the Frozen-Tarzan connection:
"I said, 'Of course Anna and Elsa's parents didn't die,'" he added. "Yes, there was a shipwreck, but they were at sea a little bit longer than we think they were because the mother was pregnant, and she gave birth on the boat, to a little boy. They get shipwrecked, and somehow they really washed way far away from the Scandinavian waters, and they end up in the jungle. They end up building a tree house and a leopard kills them, so their baby boy is raised by gorillas. So in my little head, Anna and Elsa's brother is Tarzan -- but on the other side of that island are surfing penguins, to tie in a non-Disney movie, 'Surf's Up.' That's my fun little world."
That probably counts as headcanon, but this is the headcanon of the guy who co-directed both Frozen and Tarzan. It's as close to a fan theory can get to the truth while still being a theory. Now, if only he could toss out Surf's Up and throw The Little Mermaid in there...
5. Dumbledore is Death
J.K. Rowling has been blowing minds on Twitter for a long time, but one of the most memorable morsels was the reveal of her favorite Harry Potter fan theory. While it's less exciting than say, Werewolf Draco Malfoy or Time-Traveling Ron Weasley, the "Dumbledore is Death" theory is the most compelling -- and according to Rowling, the most accurate.
It all starts with The Tale of the Three Brothers, a fable told to us by Hermoine that would appear to be the origin of the Deathly Hollows. It tells the story of a trio who, upon narrowly avoiding a watery grave, were approached by Death itself with offers of gifts for their "cunning." The first brother wished for a powerful wand, which he wields with impunity and is swiftly killed for. The second brother wished to bring back his deceased bethrothed; when the ghostly apparition disintegrated, this brother killed himself to join her in the afterlife. As it usually happens in these sorts of stories, the third brother was much smarter. He wished for a way to hide from Death, and lived many years under the invisibility cloak before revealing himself and heading off to oblivion with the Grim Reaper side-by-side.
So one brother died for power, the second died for lost love, and the third greeted death like an old friend. Remind you of anyone?
The three brothers match up pretty snugly with Voldemort (died for power), Snape (died for Lily, his lost love). Harry is an especially interesting case because he "greeted death like an old friend." Not only did he march to his doom of his own free will, when Harry perished he was met by Dumbledore.
Dumbledore himself seems to be all three brothers. When he was young, Dumbledore lusted for power; later on, he lost his sister; then he "greeted death like an old friend" -- in this case, one Severus Snape. Some have taken this further, implying that Dumbledore is in fact Death. It makes sense, since Dumbledore had the Elder Wand, the Ressurection Stone and the Invisibility Cloak in his possession at different times. This would mean that Harry "greeted Death like an old friend" in a very literal sense of the word.
The theory is so great that even J.K. Rowling is on board with it.
Since J.K. seems to be in the business of making dreams come true, this might finally be the time to propose that "Hogwarts for adults" project you've been sitting on.