The swish and flick.
5 seconds sound clip from the Harry Potter and the Sorcerer's Stone movie soundboard.
You can hear this line at 01:09:42 in the Blu-ray version of the movie.
Quote context
[...]
- You catch this, the game's over.
- You catch this, Potter, and we win.
- One of a wizard's most rudimentary skills is levitation or the ability to make objects fly.
- Do you have your feathers? Good.
- Now, don't forget the nice wrist movement we've been practicing. The swish and flick. Everyone.
- No, stop, stop, stop! You're going to take someone's eye out.
[...]