Now, that gives you the forward thrust. Now, come on, let's get a rhythm.

4 seconds sound clip from the The Sword in the Stone (1963) movie soundboard.

You can hear this line at 00:30:35.192 in the Blu-ray version of the movie.

Quote context

[...]

- You merely look like a fish. That doesn't mean you can swim like one. You don't have the instinct.

- So, you'll have to use your brain for a change.

- You are living between two planes now, somewhere between the ceiling and the floor.

- Now, there are lots of ups and downs, like a helicopter.

- Helicopter?

- Yes. It... Oh. No, never mind.

- Every flick of a fin creates movement. So, first we'll start with the caudal fin. No, no, boy. Your tail, tail.

- Now, that gives you the forward thrust. Now, come on, let's get a rhythm.

- Right, left, right, left. One, two, left and right by day and night, that's what makes the world go round.

- In and out, thin and stout, that's what makes the world go round.

- For every up there is a down, for every square...

- There is a round?

- Yes!

- For every high...

- There is a low?

- Yeah.

[...]