[dcminter]

A colleague at work tested two batteries by bouncing them in front of me. Had he merely told me about the bounce effect I would have been extremely skeptical, so I'm glad he didn't give me the opportunity to get egg on my face!

I found and submitted this article when looking for the physical basis of the effect afterwards.

I guess I was one of that day's lucky 10,000! https://xkcd.com/1053/