I had as a child a really strange phobia. It is called vermiphobia or in english the scare of worms. And in this case, it means both, parasitic worms like tape worms, leeches or roundworms but also non-parasitic worms like earthworms or lugworms. I really don't know why I had this phobia or where it comes from, but I maneged it to handle this scare with the time. I mean, I am a educated gardener, and earthworms are the best friends of every gardener. I will not say the phobia is completelly gone, but I can handle it really well.