Biggest audio hoaxes


Often when people discuss audio, they talk about "snake oil" or "hoaxes."

It's pretty typical to use the term hoax as a tactic against another who disagrees with one, or holds an unusual opinion or vouches for something which has not been verified. That's not what I mean by a "hoax." 

By "hoax" I mean an audio product or claim which has been pretty definitively disproved. Maybe not to everyone's satisfaction, but to common consensus.

So -- with that definition of hoax in mind, what are some of the biggest audiophile hoaxes you've heard of?
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I can't answer this question without upsetting tweakers.  So many things don't work as claimed, cannot work as claimed, and or make things worse. It will just turn into a p--sing contest to even mention them.
@oregonpapa ,
Hi, Frank.
Yes, geoffkait has been banned. For how long and if it is permanent, I do not know.
no romance- In fairness, MC walks the walk and don’t forget, we all stand on the shoulders of others.

That’s for sure. Which is why I credited Rixthetrick for helping me with springs.

Truth is, and this is on the record, the minute the first person came along with a coherent argument I not only listened but was persuaded and in not time flat was adopting. Of course he did have to actually explain himself, and not with incessant smart alecky jokes and riddles but actual structured argument.

If anyone can find even one coherent post about springs from the loon please do, and I will promptly eat my hat. https://youtu.be/q-6w8nZ-0sk?t=27