[jonaf]

I have also experienced this phenomenon. Why do you suppose we come to these surprises, and why do you suppose we experience them?

Is it because we are confident? Or because we lack sedulity? Or because our analysis was incomplete?

Is the surprise time consuming because we want/expect it to be easy? Or because we are focused on a different problem really. Or because our focus was interrupted.

[chrisweekly]

sedulity: diligence, dedication

good word!