Github repository web pages when down show an angry unicorn. If it's still down, here's an example: https://github.com/github/linguist

Nothing as far as I can tell. This works just as well:

https://status.github.com/?teapots

https://status.github.com/messages 17:31 UTC

Unicorn is an HTTP server for Ruby that they use

https://github.com/blog/517-unicorn

[EDIT] downvotes? really?