If you know about them in advance, they won't frighten you.
5 seconds sound clip from the The High and the Mighty (1954) movie soundboard.
You can hear this line at 01:16:42 in the DVD version of the movie.
Quote context
[...]
- When you get in that raft, you might even try singing.
- Well, I was once a fair-to-middling bass.
- I can't carry a tune in a basket, but I'm sure loud.
- Now, this is very important.
- When we actually go in, there will be two shocks.
- If you know about them in advance, they won't frighten you.
- The first will be hardly noticeable, like a normal landing.
- But the second may be quite severe, so brace yourselves.
- Soon after that, the lights will go out, but Miss Spalding and Mr. Wheeler both have flashlights.
- So, unfasten your seat belts and wait for his call. And keep calm.
[...]