Heavens to Nimrod! That was a silly question.
4 seconds sound clip from Snagglepuss - Having a Bowl (S1E12).
You can hear this line at 00:04:07.358 in the Blu-ray version of the episode.
Quote context
[...]
- Shall we go lion hunting, Clyde?
- Goo goo goo goo. Ga ga ga ga.
- Pause a moment. Pause a moment. Let's considerate this thing.
- You're over 21. You're old enough to vote. Shave even.
- The question is do you wanna go hunting?
- Heavens to Nimrod! That was a silly question.
- By Gadfrey, you're so right.
- And there's the silly answer.
- This is like old times, eh, Snagglepuss?
- Goo goo goo goo! Goo goo goo goo. Ga ga ga ga.
- Good work, Clyde! We've cornered the beggar! Now to flush him out!
[...]