I have a friend like that. He sees a snake and litterally freaks out and runs away from it.

It's totally irrational, he;'s got no basis for the fear, never been bitten or had a bad experience with a snake. I asked him once hy he was so scared of them and he replied: "It's the way they move and the way they look."

Sometimes I put a picture of an anaconda on his computer desktop just to mess with him. It's hilarious