- "hm, this is an interesting problem" to
- "aha, I have a clever solution" to
- "yes, this is really quite clever, I shall roundly pat myself on the back once I check it thoroughly" to
- "oh, wait, it has this little glitch in case 296 of 298" to
- "where is my beautiful house and why is there this flat pile of cards where it used to be".
Getting awfully frustrating, since the mistakes always seem like they arise from the same reason, but I can't articulate what it is.