Chances are you bought your Raspberry Pi for something useful like a car diagnostics tool or a wireless router. Right now, we'd rather use it for something more fun. Like a device that hijacks any Chromecasts in the area and rickrolls them.
This device, based on a Raspberry Pi and created by analyst Dan Petro, floods any Chromecast in the area with disconnect requests and then begins playing Rick Astely's 'Never Gonna Give You Up'. You can see it in action in the video above.
Petro goes into more detail about how he created this device in this video. It's unclear how or if the vulnerability might get patched, but in the meantime, it's an entertaining way to mess with your friends. Fortunately, this device still requires that you be within Wi-Fi range of the target Chromecast so, much like the notorious TV-B-Gone, it's malicious powers are limited largely to pranks and annoyances.