By Jove, there's only one thing to do.
3 seconds sound clip from Snagglepuss - Major Operation (S1E1).
You can hear this line at 00:06:12.750 in the Blu-ray version of the episode.
Quote context
[...]
- And your brother Paul, behind the prison wall?
- Sorry, old bean, but teatime is over.
- Major! Look out for them flyin' saucers!
- By Jupiter! We've been invaded!
- By Jove, there's only one thing to do.
- I'll have to jolly well resign from the club just because I couldn't capture Snagglepuss.
- Inconsiderate, is it? I'll show him.
- Hip, hip, hurrah! Hip, hip, hurrah! Hip, hip, hurrah!
- To what do I owe the Hip, hip, hurrahs, gentlemen?
- Why, for capturing Snagglepuss like you said you would, major.
[...]