I never would have guessed it was us.
4 seconds sound clip from The New Adventures of Winnie the Pooh - Pooh Skies / April Pooh (S3E5).
You can hear this line at 00:21:01.520 in the Blu-ray version of the TV Series.
Quote context
[...]
- Now that we're all together, will someone please tell me who we're so scared of?
- We're not sure if his tricks are supposed to be scary or nice.
- Silly old bear. I was the one doing the April fooling. But the tricks weren't meant to frighten you.
- Honey for Pooh, gentle pets for Piglet, cuddly pajamas for Tigger, and a balloon for Rabbit.
- But you all played the best trick of the day on me, so you're the April Fool.
- I never would have guessed it was us.
- Sure. Any fool could have seen it.
- And just in time for breakfast.
- But, Pooh, it's almost sunset.
- April fool. I knew it was dinnertime all along.
- Hoo hoo hoo hoo hoo! It was nice of Christopher Robin to let us use his fun stuff while he's gone.
- Yes, and it's too bad we're not having any fun.
[...]