Things No Adult Should Be Afraid Of...

Mottephobia - Fear/dislike of butterflies and/or moths.

Yeah... So, I used to be afraid of butterflies... It was trauma stemming from seeing close-ups of their monstrous little faces on nature shows and documentaries. I'm better now, thanks.

Teratophobia - Fear of bearing a deformed child or fear of monsters or deformed people.

It turns out that, "normal-looking" people are FAR more likely to harm you (i.e., Ted Bundy), more frightening in unexpected ways, and potentially hazardous to your health. They are also harder to repel; they aren't afraid of crosses/crucifixes, if it they don't like garlic, chances are they won't flee from the odor, and even a universal fear of fire would only hold off a psychopath for so long.

Ailurophobia, Felinophobia, Elurophobia, Galeophobia - Fear of cats.

Picture this: A kid under the age of 5 playing in her grandparents' yard. Gets access to the family cat. Doesn't know that you NEVER try to make a cat play. Tries to make the cat play. Get tagged by the cat with all claws. Little kid screams in shock, terror and pain. Grandpa runs outside and literally punt kicks the cat over the fence.
Anyway, I did a lot of learning about and have had a lot of exposure to many cats over the years. I've also lived and cared for them.

Take-Away Knowledge: As long as you don't **** with the cat, no one has to get hurt.

Pyrophobia/Arsonphobia - Fear of fire.

The older you get, the more you perspire (sweat). So, a lot of middle-aged and old people are always moist somewhere on their body (I know, not the most savory of thoughts). Plus, turns out that human beings are almost 80% water.

The Take-Away: Even with a ton of accelerant (chemical the "accelerates" or "hastens" a fire), chances of severe damage from fire are more likely than literally "bursting into flames".

Syngenesophobia - Fear of relatives. Novercaphobia - Fear of your step-mother.

Dealing with parents from an adult perspective is more likely to sadden, frustrate, anger or amuse you than anything that they could possibly do to you. Although, there are specific cases where the adult kids start something and get shot (i.e., singer Marvin Gaye).