My son won a Clapper in the family's white elephant gift exchange. We hooked it up to our Christmas tree lights, and, I gotta say, the thing is pretty great for that use case--no more reaching through pine needles to reach the plug.

And somehow it manages to do this without running TCP/IP stack. I'm working on a project in the IoT space right now, and a Clapper is making me feel kind of silly about it.