Books
Shirley Jackson was probably the same lady as Flannery O'Connor. It's all there.
Magic
J.K. Rowling confirms the canonical existence of a time-traveling Ronbledore.
Television
John Leavitt makes a compelling case that Trudy Campbell, of "Mad Men" fame, is almost certainly a KGB spy engaged in covert operations.
Travel
My new favorite conspiracy theory: The Medieval Phantom Time Hypothesis.
Personal Stories
This lady says she's Laura Ingalls Wilder, and frankly I think it's a little unreasonable of you not to believe her.
Books
The many Ronbledore deniers that have darkened our door.
Folklore
Due to a court order, J.K. Rowling has finally been forced to release the secret "Ronbledore" pages cut from an early draft of Harry Potter to the public.
Books
Dumbledore is a time-traveling Ron Weasley, according to this one guy.