Well, I was writing a zine about DNS. And at the end of many of my zines, I say "the best way to learn is to experiment! Do weird DNS experiments and see how it works". But I realized that most people, even if they have a domain, probably aren't comfortable doing weird DNS experiments on a domain that's important to them.

So I figured I'd create a domain that's just for playing around (messwithdns.com) and let anyone set DNS records on it. You're very encouraged to play around and break things.