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
If you're getting "Permission denied (publickey)", please use ssh-keygen to create a keypair. Instructions here: https://help.github.com/articles/generating-ssh-keys/
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.)