Why do people have such weird phobias?

I was watching some youtube videos of people that had phobias of pickles, peaches, cottonballs, and even balloons. So I began to wonder, why do people have such strange phobias? The people all said that they hated the texture and the look of the things they feared.

I can understand arachnophobia or fear of snakes or something, but why do people have such strange fears?

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