The enormous amount of fear is a strange thing about man. As a way of warning, it’s surely okay. Sometimes you just don’t know your life’s in danger, so that it’s good that there’s some second kind of alarm system. But on the other hand fear can be so shocking to a person, that it is way more than a warning.
There are days that you can be feared of something more easily than usual and even of things you normally wouldn’t be feared of at all:

Thanks God, you were sitting on the toilet – just in case.