Neville Longbottom - Pixar Series

Neville stared at their guilty faces.

"You're going out again," he said.

"No, no, no," said Hermione. "No, we're not. Why don't you go to bed, Neville?"

Harry looked at the grandfather clock by the door. They couldn't afford to waste any more time, Snape might now even be playing Fluffy to sleep.

"You can't go out," said Neville, "you'll be caught again. Gryffindor will be in even more trouble."

"You don't understand," said Harry, "this is important."

But Neville was clearly steeling himself to do something desperate.

"I won't let you do it," he said, hurrying to stand in front of the portrait hole. "I'll--I'll fight you!"

-Harry Potter and the Sorcerers Stone - Chapter 16