You may have a point there, Roo, old boy.
5 seconds sound clip from The New Adventures of Winnie the Pooh - Party Poohper / The Old Switcheroo (S1E22).
You can hear this line at 00:18:34.600 in the Blu-ray version of the TV Series.
Quote context
[...]
- Yeah! Better than getting some icky old bath.
- Hey, let's see who can blow the biggestest bubble!
- Yeah!
- Tigger, being dirty is fun, but maybe we need some help?
- You may have a point there, Roo, old boy.
- Excuse me, Kanga, but I believe I forgot to say, Aha!
- Pooh? Oh, Pooh, tell her who I am.
- She keeps saying I'm Roo, but I'm not Roo am I?
- Well, you can't be Roo, because Roo is out playing with Tigger.
[...]