existentially, what ike said.
immediately, black widow spiders. Those things are fucking terrifying. Today I learned that I can't think of a good word that means the opposite of what I think existential means.
And also that I might not actually know what existential means.
Most spiders don't bother me unless they're on me unexpectedly. That pretty much goes for any large insect. I don't like them sneaking up on me. But I've come to terms with any spider fear I used to have by having a few music studios in old basements. Spiders come with the territory and we've learned to peacefully coexist. Now... a black widow would be something entirely different.
I'm not particularly fond of any spiders, but female black widows are so freakishly disproportional and move so freakishly and are poisonous. EDIT: And one time when I was smallish I had to move a stack of fenceposts that was full of their webs. And therefore them. With no gloves.