Chewie, set two-seven-one.
3 seconds sound clip from the Star Wars: Episode V - The Empire Strikes Back movie soundboard.
You can hear this line at 00:38:38 in the Blu-ray version of the movie.
Quote context
[...]
- That wasn't a laser blast. Something hit us.
- What are you doing? You're not actually going into an asteroid field?
- They'd be crazy to follow us, wouldn't they?
- You don't have to do this to impress me.
- Sir, the possibility of successfully navigating an asteroid field is approximately 3720 to 1.
[...]