In no particular order:
There are plenty of reasons for a programmer to lose focus in a four-hour period.
Sometimes my boss goes directly to a developer and tries to reprioritize her tasks.
Learning the business domain by osmosis is not enough for most programmers.
Overanalysis and featuritis must be fought daily.
Overanalyzer and great coder are not synonyms.
It's hard for a programmer to explain what they are doing, even to another programmer.
Knowledge of, and love for the testing discipline, do not come spontaneously.
"Please create unit tests" does not do the trick.
"Please enter the bugs in the tracking system" does not work either.
If something can possibly be misunderstood, it will be misunderstood. If it can't possibly be misunderstood, guess what?