A bunch of sound experts have named the sound that humans find most annoying.  Some of their picks are:

1.  Vomiting.

2.  Things our neighbors do that we can’t control, like construction or throwing a party.

3.  Chalkboard scraping.

4.  A loud artificial heart valve, which creates a loud, permanent sound coming from your body . . . even when you’re trying to sleep.

5.  Voices of people you’ve been stuck with during the pandemic.