I was a sensitive and impressionable three year old when my parents made the mistake of letting me watch Jaws with them. For far too long afterward, no matter that I was a good swimmer, I was so terrified of getting in the water, even baths were a challenge. I was convinced that a shark could come up out of the drain and get me, even when the rational part of my brain knew it was physically impossible.
Thankfully, we spent so much time at swim parties or at the beach, that I decided having fun in the water was worth the risk.