Harry's lying in his bed in Dudleys second bedroom. His arm is broken and has many fractured bones. Then his day just keeps getting worse. Vernon opens his door.
"Boy! Get your lazy ass up and make us breakfast. We let you live here for free. The least you could do is follow our orders." He yelled angrily.
Now Harry's has enough. He slowly turns towards his uncle, and glares a deadly stare into his uncles eyes. Without moving, or speaking, he focuses on the whale sized man and made him faint.
He then realize what he just did, and grinned.
He just stunned his uncle. Wandlessly, and wordlessly.
With that he focused on how he did it.
(Maybe it was accidental magic? Nah. Couldn't be. I focused on it happening. Maybe magic is just about will? Possibly. Couldn't hurt to try)
With that he started to practice. He started to will his body to fix itself, to mend the broken bones and fractures. And free a few minutes he felt his arm start to move, and fix its broken state.
He was surprised, and exited that he can now do magic without a wand or words. But soon his exit meant left, as he realized he knocked out his uncle, and had to get away, fast. So he quickly reached under the floorboard, where he kept his things, and took them out, willing them to shrink, and put them in his pocket. And he left the Dursley's home.
With that, he called the knight bus.
"Hey stan" as he walked in.
"Hiya Neville" Harry still hadn't told him about him not being Neville longbottom. "
With that, he rides the bus to diagon Alley, and heads straight to Gringotts.