There is an even bigger question to this that no one has ever addressed. How does the average listener get the average turntable to roll backwards at 33 1/3 RPM's?
Having owned and seen many turntables in my life, I have never seen that as a working option.
That's actually a very good point. It's something that everyone who believes the stories mentioned here should ask themselves. I don't think any of those stories are true.