The Clapper

The progenitor of smart-lights and home-automation controls, The Clapper, first released in the mid-80s, allowed you to turn on lights by clapping. It didn’t always work, and would register other sounds as claps, and wouldn’t turn on when you clapped, but persisted despite these failures and is still available today. The customer reviews are even better than you’d expect, with treats like “I will sit and clap for ten minutes and FINALLY the light turns on” and “your hands become sore from clapping!”