The Clapper was a bad smart home gadget — and a viral sensation

Clap on. Clap off. Well, more like, Clap, pause for half a beat but no longer because otherwise it'll stop hearing you, clap again because you waited too long, clap louder and faster, that didn't work, clap two more times, and suddenly: on.

The Clapper didn't always work - and even when it did, it might fry your gadgets in the process - but it managed to become a big hit anyway.