Today I was introduced to trypophobia via 4chan. Without knowing what it was, I discovered that "clustered geometric shapes, especially small holes" do, in fact, make me extremely uncomfortable. I think it's because it makes me think of holes in my skin.
Here is an ordinary, natural object that commonly makes people uncomfortable.
Here is the image that unfortunately introduced me to this "phobia".
Just looking at these things makes my skin itch all of a sudden. Yet I'm fascinated by it.