A while ago I wrote about storing two bytes inside my mouse's DPI register. It wasn't useful. It wasn't practical. But it did something unfortunate to my brain. Once you've successfully hidden data somewhere it doesn't belong, you start looking at everything as potential storage. A monitor is storage. A keyboard is storage. A BIOS splash screen is (maybe) storage. A favicon is storage. And yes, here we are. Every website has a favicon. It's that little icon in your browser tab. Usually you uploa...