What’s your vote for the most ridiculous, overpriced, and useless tweak?

My vote: Furutech Outlet Cover 105 NCF $220, with “special crystalline material that has two “active” properties.” https://www.thecableco.com/outlet-cover-105-ncf.html

"I tried smoking rabbits as a teenager. I found them hard to keep lit."
You obviously were not doing it right...  
I understand rabbits are directional. You might check that.
OregonCaliorniaPapaDoc-I will ask you one last time-what did you pay $5,000 for? Since you have such confidence in the value of your purchase, why not unwrap the package and find out wha the heck you paid for? A bundle of nano-fibers or a bundle of cat hair or a large Russian vintage oil and paper capacitor wrapped up in squirrel fur?
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I would say if you haven't used some of the extreme high end tweaks like audiophile rocks, please don't judge them. After all, I remember the once thought snake oil products such as snake oil, bust cream and sea monkeys were thought to be somewhat suspect. Perhaps, like many people, I was to quick in judging these products without trying them.