The Wizarding World of Harry Potter is full of magical spells and unforgivable curses and some are stronger than others.

44. SNAPE: “Do you remember me telling you we are practicing non-verbal spells, Potter?” HARRY: “Yes.” SNAPE: “Yes, sir.” HARRY: “I’d worked that much out for myself, funnily ...

So, when Snape points this out, Harry delivers a hilarious and sassy comeback before he even realizes. “Do you remember me telling you we are practicing nonverbal spells, Potter?” ...