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

I vote for salt Himalayan lamp for the most ridiculed of tweaks...

The only problem I bought some used for peanuts and the light is gorgeous and they add sparkling aura to the sound if the light switch is "on" ...  Gosh! I was surprized when i forget to open the switch to "on" sometimes and discover that something was missing in the air...I discover an audio forum in china where some say the samething than me about this salt lamp ...Then this is the most ridiculed tweaks for sure not the more ridiculous at all...My best to all...

I humbly add Feng Shui and Orgone. 

What about my vote for the Maxiimus P16?

ridiculous - a glowing crystal pyramid powered by two "tachyon accumulators" housed in a tin box.
overpriced - 1800 Euros
useless - it generally makes the sound worse, smears focus and destroys the soundstage.

What’s more, they promise a "flow of electrons" from nature and electrons don’t even flow.

http://www.kempelektroniks.nl/en/918/kemp-elektroniks/products/shunt-conditioners/fostac-maxiimus-p1...

On the other hand I like their WA Quantum Chips. 

I propose to separate the 2 matters : the more ridiculous tweak and the more overpriced... The more useless and the more ridiculous tough may overlapped sometimes, but the more ridiculous(like salt lamp) is not always the more useless … And for me with my low priced vintage audio system almost all tweaks are overpriced, then it is necessary to replicate without buying when I can...