Clicky Thing

I really just wanted something that would behave on its own without too much human interference. So I built a little box that clicks when the lights are turned off. It doesn't really do much else, but the sound is created mechanically by a spinning motor that rotates a stick which strikes holes in a plastic wall. It can be plugged into any home outlet, and may not provide sleep-able noise, but people might question your sanity.

The box is a plastic container (oddly durable, though) and the inside frame is a different plastic storage container. The device is fully removable from its casing, for modification and such.

The stick that rotates is a piece of plastic tubing.

Here.