Been a while since I used a chromecast. Thought they’d need to be connected to your WiFi? Actually probably if they know you have a chromecast and are near enough to linkNo, it was around eleven o'clock right before going to bed, and the PCs were all off. Scared the living daylights out of us for a few seconds, and then it was just funny. Easy problem to solve, too. Just unplugged the thing and went to bed.
I've been pretty open about the fact that I've been out of academia for a long time, now.
to it, they could find the device like that and start it up. Is a great prank.