I was thinking the first thing we should do is Expelliarmus, you know, the Disarming Charm. I know it's pretty basic but I've found it really useful -"
"Oh please," said Zacharias Smith, rolling his eyes and folding his arms. "I don't think Expelliarmus is exactly going to help us against You-Know-Who, do you?"
"I've used it against him," said Harry quietly. "It saved my life last June."
Smith opened his mouth stupidly. The rest of the room was very quiet.
"But if you think it's beneath you, you can leave.

Auteur: J.K. Rowling