Quiet, bubble brain. I believe I hear opportunity knocking.

6 seconds sound clip from The New Adventures of Winnie the Pooh - Tigger Got Your Tongue? / A Bird in the Hand (S3E10).

You can hear this line at 00:11:59.875 in the Blu-ray version of the TV Series.

Quote context

[...]

- No, no, no, Tigger. Don't put that there. Put that there.

- Quickly, everyone, or we'll never finish before Cassie comes home.

- Do you like the flower arrangement?

- A very nice arrangement, but it needs some flowers.

- Now, I want daffodils, daisies, and jonquils, but no dandelions.

- Dandelions, daisies, and jonquils, but no daffodils.

- That's not what we're here for.

- What are we here for, Stan?

- Quiet, bubble brain. I believe I hear opportunity knocking.

- Do you suppose this will be enough of my honey for your party, Rabbit?

- We need two honey cakes, three loaves of honey bread, and dozens and dozens of honey cookies.

- Well, we can always get more.

- I was afraid you might say that.

[...]