Getting evicted. I don't do anything wrong or break my lease in my apartment, and have never had a complaint against me but for whatever reason I get super freaked out when someone knocks on my door. Even if it's just a delivery driver.
I remember one time I actually called off sick at work because I saw my landlord on my ring doorbell tape something to my door and I was literally worried sick. Started thinking I had to start looking for another place.
Turns out it was just a notice saying that they were going to give residents a free fire extinguisher in the coming days. All that panic for nothing.
Same, it's a classic