That reminds me of something one of my acquaintances (who shall remain nameless) forwarded to me recently. It was a bit on testing batteries without a voltage tester and had a YouTube video showing (purportedly) that a good battery when dropped from two or three inches onto a hard surface will just stop, but a discharged battery will bounce. Then they go on to demonstrate. They claim to not know why it works, maybe gas change inside, but it just does. I haven't tried it, but it sounds like internet bunk to me. I could find the link, but of course it wouldn't prove anything. Any other bull**** meters going off?
"I am often asked how radio works. Well, you see, wire telegraphy is like a very long cat. You yank his tail in New York and he meows in Los Angeles. Do you understand this? Now, radio is exactly the same, except that there is no cat." : Albert Einstein