7. Bane Is A Genetic Mutant
Speculation: While in the comic book iterations of Batman, Bane is known as an only superficially plausible entity, pumped full of Venom to make him an impossibly large foe for the Caped Crusader. None of us expected this to be translated into Nolan's universe, and so it was assumed that, upon his announcement as a villain in Rises, he would be brought into the more plausible realm somehow. One of those ever-informative set spies reportedly snuck onto a set moments before it was locked down and discovered that Bane's origins emerge from his village being burned down. He is the sole survivor and catches the attention of Ra's al Ghul because he appears to not flinch despite being set aflame; he appears to be genetically impervious to pain.
Fact: This one is too far-fetched to really settle in comfortable with Nolan's realistic take, given that there are few conditions on Earth that would render you invulnerable, on a nervous level, to burning fire. While Nolan did eschew the more flowery and fantastical elements of Bane's origin, he settled for something more grounded and ambiguous; the simplicity of a mask that dispenses anaesthetic to ease the pain of a brutal beating, and little more. Much like The Joker, it is the simplicity - even the ambiguity - of his origin that makes it more successful against other methods, which would likely heap exposition all over it instead.