Sometimes, you just have one of those days. One of those days where you manage to find flow, and stay in it. One of those days where you move from test, to code, back to test, back to code with ease. One of those days when you don't feel like you're fighting the environment (the fact that I didn't have to do any EJB work helped there).

One of those days when coding feels like you've been given a block of wood, and you're carefully carving the edges away, polishing the grain. You may not end up with a big pile of code, but everything that's left serves some purpose. One of those days when you delete a method and smile, because your code is that much more elegant. Every line is justified, and contributes to the beauty of the work.

One of those days when you can stick "Everything below this point is done by magic" in a comment.

One of those days you remember why you got into this fucking annoying business in the first place.

Addendum: Found this quote in the Jargon File entry for hack-mode

...the sensation of being in hack mode is more than a little habituating. The intensity of this experience is probably by itself sufficient explanation for the existence of hackers, and explains why many resist being promoted out of positions where they can code.