What are you afraid of? I can tell you my cat is afraid of a plastic bag, especially one stuck around her as she is running. She was probably thinking it was going to get her. She hid behind the refrigerator with the bag still around her because she was afraid. She didn't come out until I moved the refrigerator and took the bag off her.
I'm afraid of snakes--even small ones. My husband can't stand wasps, but then he's been stung several times. Any time one gets into the house, I'm the one who has to go after it. Of course, if I see a snake, I make him take care of it. So what makes you quiver in your shoes?