Ron was seven years old, and Fred and George Weasley were nine. The twins had gotten in trouble for playing Duel with Bill's wand. They were De-Gnoming the garden as punishment. Ron was reading his comic collection. He was in a particularly long issue of "The Adventures of Martin Miggs, the Mad Muggle."
Meanwhile, the twins were trying to catch a surprisingly cunning and very fast gnome. While they gave chase, the other, no longer dizzy gnomes re-entered the garden.
Upstairs, Ron heard yells of exhaustion from the twins. There was a thump. He looked up, to see that a gnome had been thrown through his window and into his room. The gnome then set to tearing apart his Chudley Cannons Poster and, to his horror, the gnome proceeded to defecate on his bed. He threw the gnome back out through the window, and ran downstairs to the garden.
"What're you doing!"
"Don't worry Ickle Ronniekins-" Started Fred.
"-Gnomes don't bite. Unless you're-" Continued George.
"-Scared." The said simultaneously.
The threw one more gnome, before Ron delivered the low blow.
"I'll tell Mum." He said.
They glared at him.
"You wouldn't. And even if you did, we would just do what we did to your teddy…" said Fred.
Ron shivered. They kept throwing gnomes up his room.
"I said Stop It!" yelled Ron.
There was a bang, and immediately, the twins were thrown clear over the hill, on the other side of the field, even.
Best part is, Molly Weasley was never the wiser.