When in the same house as me, I will mildly freak out if you come into the room and I didn't hear you coming in, even if you are 5 ft away and just minding your own business. I confess that I run the 3 ft from my bathroom to my bedroom late at night, and always always turn on my bedroom light to make sure no murderers snuck in there while I was away.
.... People take advantage of this. It has made the problem worse.
I react pretty much the same way as Taylor Swift when people intentionally scare me. I got your back, T. Swift.
and don't worry, the flinching that happens after something like this will subside... somewhat.
Have a Happy Halloween!