Fun, DIY electronics kit has only one function: Turn it on and it turns itself off.
Every flip of the switch will also make a smile appear on onlookers.
One of the silliest electronics kits ever and you can get it for only $39.99!

The Useless Box Kit arrives as most kits do: a pile of parts. With easy to follow instructions, you’ll be assembling your Useless Box Kit very quickly. Whip out your soldering iron, do a little bit of work, and then screw the thing together. When you’re done, you’ll have your own gleaming acrylic box. Set it on your desk and wait for curiosity to cause victim after victim to turn it on – each to be met with the little finger turning the box back off.