I'm scared of people holding knives. If someone is cutting food with it, I'm fine. But if they turn around and start chatting or something whilst holding it, I freak out. I start by feeling uneasy and very quickly escalate to asking them as calmly as possible to put the knife down like I'm in some serious situation or something. I don't get it! I go into full anxiety. Don't feel any other fear around knives. I wash them, use them and have them in drawers. No problem.
Also found out the other day DS is scared of balloons. He freaked out!