"It's scary" or "That's frightening"
Here are some examples of how it might be used:
* "Le bruit de la tempête, ça fait peur!" (The sound of the storm is scary!)
* "Ce film est tellement violent, ça fait peur!" (That film is so violent, it's frightening!)
* "Ça fait peur de penser à ce qui pourrait arriver." (It's scary to think about what might happen.)
You can use "ça fait peur" to express fear or apprehension about something.