Dogs with loud barks, bells that have no warning of when they're going to ring, smoke alarms that are so ear-piercing, sirens suddenly switching on as they pass in the street, builders banging and crashing on roofs or scaffolding, plates clanging together, cars bibbing/immature tossers screaming things out car windows at me (I put them into their place by sticking my fingers up, because even if it's a compliment I still can't be bothered with that crap, if somebody likes me I like them to act on it in a mature way, screaming at me out of car windows just puts me on edge.)
Unexpected noise makes me jump, but I find bracing myself for a sudden noise (without putting my fingers in my ears or anything) the sudden noise still makes me jump even more than if I wasn't expecting it. That's because I'm so on edge that my brain presents the noise in my head repeatedly and I can't do anything to distract it from what's going to happen, and so it keeps on repeating and repeating until the real noise does occur, by then I am so on edge that I still jump anyway. That's even worse.
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Female