I once accidentally blasted myself with high frequency hearing test sounds (couldn't hear it so I kept turning it up, not realizing that it was super loud and I'm just super deaf) on my home theater. We all make mistakes sometimes.
It happens to be exposed to city traffic. It happened to me many times. I agree that car horns and breaks are the worst. I hope it subsides.
I have tractor trailers driving by my house. Google Jake Brake but turn the volume way down before you watch. Horns are so unanticipated and random.