How the madam at the German army medical examination used to say after my hearing test: "You hear, what you want to hear."
Luckily, despite more than a decade of Metal, my hearing is still very good, but there is one anomaly that I have since my teenage days: Some women speak in a tone, that seems to be filtered out from my brain and delegated to "ambient noise". Noticed it a few times, they can speak very loud to me but unless I focus on them, I hear nothing and when I am just slightly distracted, I can see their lips move but not hear a sound. Which is funny, if it is about music, I can hear any tiny piano line in the background of a song, that plays in the same frequency range.