Atomic hydrogen arc welding - videos

[nova_robotics]

I got an idea on how to make one for amusement, based on the steel balls hung from a frame that bounce back and forth. Just have to hide a few items here, a battery there... And then set it on a shelf and start it before a meeting with someone. At some point people should, in theory, notice it's still clacking and isn't slowing down.

https://en.wikipedia.org/wiki/Oxford_Electric_Bell

You might be on to something.