I have an insect phobia (including spiders). In E"Y whenever there was a dzhug in the house I'd totally panic. I usually managed to kill them myself (before I got married) and then had to ask a neighbor to help me take it out of the house. After I got married, my wife took over.
Even when I was much younger, before I became frum, when I would watch Discovery Channel, I would always avoid the screen during commercial breaks, because you could never know if a huge image of an insect would suddenly appear on the screen. The few times that happened, I literally screamed so loud neighbors might have thought someone was trying to kill me.
Second phobia: falling from stairs. No clue why - I wasn't this afraid of stairs when I was younger. But in recent years, I have developed an extreme fear of falling from stairs, so I *never ever* walk on any stairs without holding on, and I walk quite slowly.