“But you are a pureblood, aren’t you, my brave boy?” Voldemort asked Neville, who stood facing him, his empty hands curled into fists.
“So what if I am?” said Neville loudly.
“You show spirit and bravery, and you come of noble stock. You will make a very valuable Death Eater. We need your kind, Neville Longbottom.”
“I’ll join you when hell freezes over,” said Neville. “Dumbledore’s Army!” he shouted, and there was an answering cheer from the crowd, whom Voldemort’s Silencing Charms seemed unable to hold.
Harry Potter and the Deathly Hallows – J.K. Rowling