Because it's Winds-day.
5 seconds sound clip from the The Many Adventures of Winnie the Pooh movie soundboard.
You can hear this line at 00:27:30 in the Blu-ray version of the movie.
Quote context
[...]
- I... Oh, bother, you made me forget.
- If I was you, I'd think about skedaddling out of here.
- Why?
- I think I shall wish everyone a happy Winds-day.
- I shall begin with my very dear friend, Piglet.
- Piglet lived in the middle of the forest in a very grand house, in the middle of a beech tree.
- And Piglet loved it very much.
[...]
Audio clips of the best quotes and sound fx from The Many Adventures of Winnie the Pooh (1977) movie that you can use as custom computer sounds. All waveform audio files are in wav and mp3 format.
Actors: Sterling Holloway (Winnie the Pooh), John Fiedler (Piglet), Ralph Wright (Eeyore), Paul Winchell (Tigger), Junius Matthews (Rabbit)
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