“Because they got the gold from me. I gave them my Triwizard winnings last June.”
There was shocked silence, then Hermione’s teacup jogged right over the edge of the desk and smashed on the floor.
“Oh, Harry, you didn’t!” she said.
“Yes, I did,” said Harry mutinously. “And I don’t regret it either — I didn’t need the gold, and they’ll be great at a joke shop. . . .”
“But this is excellent!” said Ron, looking thrilled. “It’s all your fault, Harry — Mum can’t blame me at all! Can I tell her?”

Harry Potter and the Order of the Phoenix – J.K. Rowling