Jeff Keacher wanted to get his Mac Plus, now well into its third decade, online. It had been on BBSes and text-only Lynx via dial-up back in the day, but Keacher wanted to go full TCP/IP. And it worked. He even loaded Gizmodo for us!
NOSTALGIA ALERT! There is now an honest-to-goodness Retro MacOS emulator for jailbroken iPhones in the form of Mini vMac, which loads disk images and everything. It's like getting your first Mac all over again.