I'm new here, but not too long before I took my first steps into higher-end audio, I found these:
The Sentry Wind-Up MP3 earbuds. I thought I was lucky to win these at an arcade in Vegas, considering my last pair of cheap earbuds broke on me in the middle of vacation.
But then I started using them.
They didn't have left or right labels, so I had no idea which earbud went in which ear. Furthermore, I was not an audiophile then, so I don't remember how it sounded aside from the non-existent bass, but you really didn't need to know much about audio to tell that these were terrible. And worst of all, one ear shorted out just days after getting them, before I even made it home from said vacation.
With all of this going for it, I find it hard to imagine even the most passive, casual listeners being satisfied by this junk. Even if they were free, I would never take them again.