Sunlightning

I'm sitting next to the window with the white blinds almost closed. There must be a big tree right outside the window, blocking the sunlight, because it's fairly shaded.

When the wind blows (the wind has been having tons of fun today), it moves the branches out of the way and, to someone typing away at her computer next to the window, creates the same effect as a bright bolt of lightning -- in the middle of a sunny day.