Dear forces of light, please teach all these (some of them quite clever) folks about basic conservation of energy as how it's immutable, not speed of sound immutable, immutable...
Sure, if it *ever* happens that *one single* repeatable experiment ever appears which violates this, we will all have to start thinking about new theories which predict what we observe. Until then, I invite all predatory, destructive snake-oil artists to suck my ...
Sorry for the strong sentiment, but I can't *stand* this anymore. I can't stand watching youtube videos of people with obviously incredible machining skills building weird devices which will never achieve the effect they hope.