[maccard]

DNS's caching behaviour in the wild is incredibly infuriating. We have one team member at my company who is stuck with a stale DNS record for one of our internal services in our application, but their browser works just fine. I've absolutely no idea how to actually fix it, so for that one persons benefit we bought a whole new domain and ported everything to that.

Split DNS has let us do some cool things, and simultaneously caused no end of headaches. See above for the sorts of headaches.