We must make a pact to never tell Christopher Robin about this.
5 seconds sound clip from The New Adventures of Winnie the Pooh - There's No Camp Like Home / Balloonatics (S1E3).
You can hear this line at 00:18:17.339 in the Blu-ray version of the TV Series.
Quote context
[...]
- Oh, it's no good. Pooh, we popped the balloon.
- What shall I tell Christopher Robin?
- You don't suppose he'd believe it was asleep, do you?
- No! I must tell him the truth!
- No, no, no! If you tell him that he popped his balloon, he'll never talk to us again.
- We must make a pact to never tell Christopher Robin about this.
- Oh, can't sleep either, huh, balloon?
- You, Pooh Bear, have been accused of popping a balloon!
[...]