Mushrooms. Seriously. ( ' - ')
I suppose it's rather unusual, but I have mycophobia, the fear of mushrooms. I don't want to touch them. I don't like seeing them. I hate their smell. Unexpectedly noticing one within 2 meters of me makes my heart jump, giving me a brief sense of panic.
I wouldn't say they keep me up at night, but they used to. As a kid I had nightmares about them, which I think played a key role in forming my phobia.
I love the beauty of autumn, but I feel uneasy walking outside, knowing that I might encounter mushrooms should I stray off the road too much.