It's been said before, but spiders and needles.
I'm not proud of it, but as a result of my fear of needles, I almost fainted while getting my BCG (no idea what it stands for) and the nurse told me to lie down behind a screen until I felt better. Now there was this rumour going round (I've not met anyone who has had it happen, but everone believed it, so maybe it was true) that if you were somehow too thin for the injection in your arm, they laid you down, lifted your legs and put the needle in your backside. Some people who were waiting for their turn could see my head lying on the ground just behind the screen and since I'm not exactly big... well, you get where this is going. I spent a week being picked on for that, and by the time the scar in my arm had showed up, nobody cared anymore and decided to still believe I got the injection elsewhere. Even when they could see the scar.
ANYWAY! Sorry about the rant, that was not why I'm afraid of them, just thought I'd like to share it with some random people. I've no idea why I'm scared of needles, it just really affects me. I can't watch them on tv or in a movie without needing to lie down for a bit, it's that bad. Even when it's not real.
Also, things that buzz near my ear but I can't see tend to make me duck down, wave my arms about and run a mile, somehow all at the same time. Not sure what fear that is, but it's probably both confusing and hilarious for anyone who sees it.