That's a pretty good gag.
I'm pretty careful not to buy too many "worst" things, and unless it cost less than a buck or so, things that aren't good enough to keep get returned, so it's hard for me to remember what was the worst, or even particularly bad. Heck, I can't even remember what I had for breakfast this morning.
One of the most useless audio things I've had was given to me for a review - a single point stereo mic. an Acoustic Solutions 222HD. I was a relatively new Zoom H2 user at the time and I was hoping that it would become a reasonable stereo mic that I could place where I wanted it rather than putting the whole recorder there. The Zoom mic was actually pretty good for the application, just inconvenient in some recording situations.
I never was able to give the Acoustic Solutions mic a fair trial as the output level was so low it was unusable at distances more than about six inches - not how you want to place an "overall" stereo mic. Too bad, as it's really nicely built, with a locking (screw-in) mini plug on the mic end of the supplied cable, a foam wind screen, and a solid clip. It was also pretty inexpensive, about $50 as I recall.
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