Don't be alarmed, ladies and gentlemen. Those chains are made of chrome steel.
4 seconds sound clip from the King Kong (1933) movie soundboard.
You can hear this line at 01:30:03.486 in the Blu-ray version of the movie.
Quote context
[...]
- I want you to meet a very brave gentleman, Mr. John Driscoll.
- Miss Darrow first, alone. Stand in front of Kong, Ann.
- OK.
- Don't be alarmed, ladies and gentlemen. Those chains are made of chrome steel.
- Get them together, boys. They're going to be married tomorrow.
- Put your arm around her, Driscoll.
- Wait a minute, wait a minute! Hold on! He thinks you're attacking the girl!
- Aw, let him roar. It's a swell picture.
- Look out! He's getting loose!
[...]