Harry was a time traveler. He really was, after living for 230 years he could feel his magic slipping away and his reactions slowing down. So, using his power, connections, and knowledge that he acquired during his tenure as Minister of Magic, Headmaster of Hogwarts, and Supreme Mugwump of the ICW he collected everything he wanted or even felt slightly interested in. He took all of his money and his family history and packed them up in a dozen multi compartment trunks and tied them directly to his soul.

When he arrived in the past he was merged with his younger self making it easier to act as a child but he had primary control. Everything was going fine until he arrived at Hogwarts and the Sorting hat was placed on his head.

"AAAAHHHHGGGG, MONSTER GET ME OFF HIM. PLEASE HURRY GET ME OFF HIM. DEMON CHILD. SAVE ME, LORD AND MASTER VOLDEMORT SAVE ME FROM THIS DEMON CHILD."

Mcgonagall ripped the hat off of Harry's head in shock. Everyone stared at him in shock and horror. Never in the history of Hogwarts had something like that happened. Not even Voldemort himself caused the Hat to act like that.

Worse, the hat was still shouting, "THE BLOOD, THE SCREAMS, THE HORRORS, ALL THE FIRE. THE DREAMS OF OCEANS TURNED BLOOD AND THE CORPSES OF HIS ENEMIES PILED TO THE STARS. KEEP THE MONSTER AWAY."

As Harry was led away by Albus, Harry felt a touch on his mind by the Hat. "That will teach you to prank me you little brat. I always get my revenge, even across time."

Up in the headmaster's office Harry sulked. His plan was going so well to, only for it to get derailed by that damn hat.