The fear of doctors.
Now, this one I totally get. I don't fear them because of needles or invasive exams though. No I fear doctors because, as everyone knows, doctors are time vampires. A doctors visit has the potential to absorb your whole day. You have a 1:00 appointment but that doesn't matter because in a doctors office the concept of time only applies to the patients. Doctors went to medical school which gives them lordship over time and clocks.
My kids were always really afraid of doctors when they were little but that's mostly because the doctors would whisper to us parents and then we'd snatch those tiny little people right up and let the doctor poke and prod them. I would hate doctors too if I knew that if you took my feet off the ground I would be completely defenseless against needle assaults from practical strangers in white coats who could get my parents to turn on me so easily and help him stab me.