The need to be more observant...

“Harry! What are you doing back here?” Professor X asked as the boy appeared in the fireplace.

“I was gonna be expelled so I came back here,” Harry said.

“What do you mean you were going to be expelled?”

“I had a piano dropped on a teacher, so I figured it was a pretty sure bet,” Harry said. “But don’t worry, he had an evil back of the head.”

“You killed a professor?”

“He didn’t give me much choice,” Harry said. “And I didn’t kill all of him. The back of his head floated up into the sky and swore revenge. People tell me that the back of the head killed my birth parents.”

Professor X just looked at him blankly for a moment. Harry took that moment to glance around and noticed that a good part of the Mansion was destroyed. He gave the professor a depressed look as red psionic armor started to coalesce around the former leader of the X-Men.

“Awe crap, you’ve turned evil haven’t you?”