The book I have been referencing for the Anxiety and the Brain series (Rewire Your Anxious Brain) has some examples of how anxiety can affect someone, and why amygdala-based anxiety does not always make logical sense.
The Anxious Teddy Bear:
A lady was presenting a teddy bear to her grandson, who was running happily toward her. Then he suddenly fell and split his lip open on the driveway.
Now he experiences amygdala-based anxiety whenever he sees a teddy bear. Because the perfectly harmless teddy bear was associated with the pain of the injury, the teddy bear became a trigger, leading to a fear of teddy bears. Read more