“What's up?” said Hagrid.

“Nothing,” Harry lied. They stopped to buy parchment and quills. Harry cheered up a bit when he found a bottle of ink that changed color as you wrote. When they had left the shop, he said, “Hagrid, what's Quidditch?”

“Blimey, Harry, I keep forgettin' how little yeh know — not knowin' about Quidditch!”

“Don't make me feel worse,” said Harry. He told Hagrid about the pale boy in Madam Malkin's.

“— and he said people from Muggle families shouldn't even be allowed in—”

“Yer not from a Muggle family. If he'd known who yeh were — he's grown up knowin' yer name if his parents are wizardin' folk. You saw what everyone in the Leaky Cauldron was like when they saw yeh. Anyway, what does he know about it, some o' the best I ever saw were the only ones with magic in ‘em in a long line o' Muggles — look at yer mum! Look what she had fer a sister!”

“So what is Quidditch?”

“It's our sport. Wizard sport. It's like — like soccer in the Muggle world — everyone follows Quidditch — played up in the air on broomsticks and there's four balls — sorta hard ter explain the rules.”

“And what are Slytherin and Hufflepuff?”

“School houses. There's four. Everyone says Hufflepuff are a lot o' duffers, but—”

“I bet I'm in Hufflepuff,” said Harry gloomily.

“Better Hufflepuff than Slytherin,” said Hagrid darkly. “There's not a single witch or wizard who went bad who wasn't in Slytherin. You-Know-Who was one.”

“Vol-, sorry — You-Know-Who was at Hogwarts?”

“Years an' years ago,” said Hagrid.