This is related, but not a joke.
In the mid-seventies I saw Black Sabbath live, sans ear protection, and the first few songs sounded great.
Then, as it became clear the volume was REALLY loud, I noticed my ear canal was actually slick with what I presume was earwax!
I immediately stuffed my ears with tissue shreds and, as usual, had some ringing the next day but it went away.
Never happened before or since.