Self-closing box

I saw an instructable where a box has a toggle switch, and when hit, the box turns the switch off. I can't for the life of me find the instructable now. What is it?

orksecurity7 years ago
Websearch "most useless machine". I'm not sure "most" is actually in the title. There have been several versions; the simple analog approach is the one which I found most entertaining.
Thank you i have been looking for this! :)
gbot7 years ago
I don't know if you have found this yet but here is a link to "The most Useless Machine Ever"