A few days ago I posted a link to The Most Useless Machine. Useless but pretty cool. Apparently Claude Shannon used to have a similar device on his desk he called the “Ultimate Machine” based on an idea by Marvin Minsky. There are more details and a few videos of other versions of the box at www.leavemealonebox.com
The design reminds me of a coin bank I had as a kid. You put a coin on top and a skeleton hand pops out, drags the coin away and closes back up. I’ve found several videos of similar banks on Youtube.