People watching shit on their smartphone with the volume full fucking blast. What happened to Airpods and the like? Use them ffs! not a single person wants to hear whatever bullshit is coming out of your phone.
Honorable mention: cars with speakers in the grille. Not one single solitary person wants to hear your stupid playlist either, and your speakers fucking suck anyway. Yes, I'm talking to you, bozo in the donked out Chrysler 300 that drives down my street.