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

Magical rocks you spread around the listening room.
Red and blue crystals that are  put on your tonearm.
Fairy dust.

Re - the PWB red pen. This tweek wouldn't work for me at all. The term "Past" is not dominated by all that is "black evil and horrible". For me, it's where all the best recorded music exists. The "Present" is black evil and horrible.

“This tweak wouldn’t work for me at all.”

>>>>You must be the exception that proves the rule. The future’s so bright I gotta wear shades. 😎 itvcan be mathematical proved there is no Present Time. By the time it gets here it’s already The Past.

If the Red Pen wouldn’t work for you it might be because your system isn’t resolving enough.

stereo5
Magical rocks you spread around the listening room.
Red and blue crystals that are put on your tonearm.
Fairy dust.

>>>>>Geez, speaking of spreading it....

A sufficiently advanced idea is indistinguishable from magic. - audiophile axiom

To quote from the PWB site

"...what you can do is to ‘treat’ the cables, wires, components, equipment and listening environment to give them different ‘energy patterns’ which we (human beings) are able to interpret as ‘friendly’., ‘acceptable’., ‘reassuring’ and ‘relaxing’. Once you do this, the human being can relax, be under less tension and hear (perceive) more of the information which is already in the room !!..."

But if you don’t accept/agree with a basic premise of the suggested operation of the specific device (in the case of the red pen, that "the past is black evil and horrible"), how can you relax sufficiently for the device to perform as intended by the designers, regardless of the resolving power of your system?