You’re sitting in your living room. All you want to do is watch some Game Of Thrones on your day off… but your Chromecast refuses to respond. All it will do is play Rick Astley’s Never Gonna Give You Up… over… and over again. It might be this little box’s fault. Built by security analyst Dan Petro as a proof of concept, his so-called “Rickmote” is able to discover any Chromecasts nearby, boot it off whatever network it’s on, and send any video the prankster desires straight to your screen. So how does it work? Petro has a 20-minute breakdown video here, but here’s the gist of it: The WiFi standard has something called a “deauth” command built-in, which tells a device that it needs to leave the network and try to reconnect. For one reason or another, this command is sent to a device without encryption… which means it can also be sent from devices that aren’t actually allowed on the network.