Mine is computers in Safe Mode 
I had a nasty browser locking, ransomware virus a while ago, and had to make a new admin account using Safe Mode to get rid of it. I tilted the laptop screen back so I could barely see, and typed what I needed to at arms length as if the computer was about to explode. I don't know why, I just fucking hate it, it looks wrong and scary. I had the worst panic attack when I'd finished, could barely breathe I was so scared 
I think if I ever saw binary code in real life, I'd drop dead on the spot 
Are you scared of anything for no apparent reason?