A similar online topic had me considering my biggest fears. I don't have many fears, but the thought of being in water (oceans, lakes, rivers, swimming pools) terrifies me. As a result, I never learned how to swim. When I was in Navy Boot Camp, I was required to swim 50 yards. They taught me the elementary back stroke; I swam 50 yards; and that was the one and only time I went swimming.
What are your biggest fears (if any)?