I wrote a custom SSH server in Go, give it a try. It uses your terminal user and SSH keys to authenticate implicitly. Instead of getting a shell, you get an IRC-style chatroom with everyone else.

  $ ssh chat.shazow.net

SSH is a really cool protocol; it's a lot like HTTP2. This is a demo of one thing you can do with it, but I plan to factor out the code into libraries that will let you build all kinds of experiences that can be used with any SSH client.

The source code is here: https://github.com/shazow/ssh-chat

(Should be reasonably stable and handle thousands of connections, but apologies in advance if it crashes: Try to reconnect in a minute.)