What if we all actually went to Hogwarts and at one point we did something so bad that we got ourselves expelled and one of the professors used Obliviate on us before we left so we wouldn't go blurting out that the wizarding world actually exists (admit it, one of us would've done it) and so our whole memory of its existence was erased and because of it we're forced to believe that it's fictional.
I HONESTLY JUST BLEW MY OWN MOTHERFLUFFING MIND. O-O