Why, hoo hoo, it's obliviously a Happy birthday, Tigger kind of card.

5 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 00:17:02.738 in the Blu-ray version of the TV Series.

Quote context

[...]

- Guess you'll want to be ransoming her now, huh?

- Ransom? Certainly not because, in order for there to be a ransom, there must first be a ransom note.

- Knew we forgot something.

(Hammering nail)

- I found this note on my door, and I'm fairly certain I didn't put it there.

- What does it say, Pooh?

- I believe we shall have to read it.

- Why, hoo hoo, it's obliviously a Happy birthday, Tigger kind of card.

- Or it could be an invitation to breakfast or lunch or dinner. I'm not particular.

- Perhaps we should ask Rabbit to read it.

- Hello! Anybody home?

- Or perhaps, Tigger, since Rabbit and Cassie are not here, this note is from them telling us where they are.

[...]