Spiders, Sudden loud/high-pitched noises, going to the doctor, my stepmother's bad moods, being abandoned by everyone I care about, people in general.....
When I was little, some of my irrational fears were of thunder and lightning, and of touching cigarette butts and fecal matter. I once saw a cigarette butt someone had flicked into our backyard and freaked because I thought it was contaminating the yard, and my mom kept telling me to just pick it up, but I felt like I couldn't or I'd "get sick" or "die" (My parents really put the fear of God in me re: smoking being unhealthy, and I still don't smoke now even as an adult...not only bcuz it's bad for you, but bcuz I just have no interest). I was also scared of the two boys who lived across the street because if they saw me in my front yard, they'd coming running over and start playing too rough with me. It got to where I wouldn't even leave the house without at least one of my parents with me.
My irrational fears got worse after my parents' divorce - my mom told me once that I'd freak out if she took a different way home, and she would purposely drive different routes....she thought I freaked out bcuz I hated the change in routine, but if she'd bothered to ask, I would have told her that I was scared she was driving me out to somewhere in the boonies (and where I live is pretty close to the boonies) and was going to just leave me there the way she'd left my dad at our house (she'd moved into an apartment after the divorce was final).
I was also scared of gorillas for awhile, I think cuz of this book....I really don't understand why this book made me scared of gorillas; going back and looking at it, it's just a sweet story about a baby gorilla who was loved by everybody, lol. Maybe it was the illustrations. Annnnyyyway, my fear of gorillas was actually pretty short-lived, since Disney's Tarzan came out not long after my fear developed, and I saw it and really warmed up to the gorilla characters, like Terk and Kala. 
_________________
I wish Sterling Holloway narrated my life.
"IT'S NOT FAIR!" "Life isn't fair, Calvin." "I know, but why isn't it ever unfair in MY favor?" ~ from Calvin and Hobbes