If you make memory, you will find a moment when you were scared. This does not mean you lost control of yourself.
If you don't, they will think either you are a lier, or are not experienced.
They are probably expecting you to say an occasion when you were scared, and then they will ask you how you reacted. This is what they are really looking for. Don't be a hero, by the way.
I guess.
It is worse when they ask about you fliying with a captain who did not follow the SOPs, and how you reacted. In that case I would love to ask the same question to the interviewer.