Bugs. I hate you right now lol. I hate insects and beetles so much my bio teacher in high school let me collect and categorize leaves instead. The *thought* of cockroaches being in a closet at a previous job had me frozen in fear.
Ghosts. I love ghost shows, anything ghost related, but the thought of actually seeing a person walk by me that isn't living freaks me out.
Big bodies of water with no land in sight. Think like in a raft in the middle of the ocean. Whales are huge....what if there's one near me? Ughgh, freaking myself out thinking about it.
An apocalypse.