I hate that feeling when you drive into work and think it's going to be a shit day. Tired, suffering from another restless night and an early morning (needing a holiday), the drive in is slow because of lorries. And then, you get into work, set up the laptop and make a cup of tea, you look out of the window and see a rainbow. Physics on the grand scale.

Perhaps it won't be such a bad day after all. :-)