Due to the fact that my mom and I have lived with some rather mean (read: abusive) men, I am afraid of strangers from the male gender.
It's rather severe.
For example, if I see a guy that looks remotely like he could be mean to me - namely, 99.99% of the male population - I will edge away, grab onto the sleeve of whoever I am out with, and put them in between myself and the strange man.
And I am also paranoid.If I hear a strange sound, I freak. If the guy my mom and I live with (who is a nice guy) comes home and I don't hear him call out, I grab a knife and go on a kamikaze sniper mission with my dog, who did hear him and knows it's him. See post "Plastic Rifle Cases Don't Make Good Weapons, They Don't Intimidate Very Well".
I heard an all-around sonic ringing while I was reading (alone) once. My dog responded to it as well, and it wasn't like the normal ear-ringing one gets. I went upstairs and fetched my guy my mom and I live with (who was doing his emails) and he checked the closet my dog had focused on- nothing there. I camped in his semiofficeroom until my mom came home.
And that's about it.