I have an irrational fear of flying birds. Chickens are just fine. I know chickens can fly, but not very well, or very often and I am fine with them, the same goes generally for turkeys. Water birds don't really bother me, what scares the crap out of me is small tree nesting birds. The kind that fly at me, by me, especially near my head. Maybe this is a result of watching Alfred Hitchcock's The move "The Birds" as a child, but small flying birds scare me.
Rationally I know I have never been hurt by one, in fact no one I know has ever been attacked by a small flying bird. But they always seem to be headed directly toward my face. Silly I know.
We all have irrational fears. I was on the metro one morning recently. The woman sitting in front of me was drunk, no two ways about it, you could smell the booze from five feet away. As she sat there staring at her phone and there was a spider crawling down the sleeve of her coat. This freaked out the person sitting next to me, who fled down the aisle. I calmly said, "mam, there is a spider on your sleeve", she flicked it off on the floor, stomped on it and went back to her phone. One person freaked out - I know how she felt, I might have done the same thing if it had been a sparrow crawling down the sleeve of the woman's coat, two of us were unfazed by the spider. What is rational and what is not, is all a matter of your mind or state of intoxication.
So, what is your irrational fear?