Quite often on my commute [too long], I see these crazy cloud formations from on coming bad weather that I just want to pull over and take a picture of. But I know better not to cause rush hour craziness by pulling over to take picture of the sky [rubbernecking :)].
But yesterday as I was leaving the restaurant, the clouds were in rare form and I got my picture. They almost looked photohop'ed. You could tell something big was coming, they were moving and changing shape so quickly.