Bad Horse traceroute
A traceroute to bad.horse spells lyrics through reverse-DNS names; signed.bad.horse adds a separate Easter egg in its TLS certificate chain.
The bad.horse route turns reverse DNS into the lyrics of Bad Horse’s message from Dr Horrible’s Sing-Along Blog.
The zone also became known for signed.bad.horse, a certificate-chain variation on the same idea. The route is a compact example of DNS names used as a narrative surface.
Primary source: https://www.youtube.com/watch?v=O03k0DV2m1k