Clouds. With the right lens and a lot of patience (and luck), they can do some beautiful things. That's why my head can so frequently be found among them. The wind shear at the top of the formation above, shot in Kill Devil Hills, NC in 2010, makes it look like a thin veil. Or something.
Storm-watching from the comfort and safety of one's balcony at the beach - a nice way to spend a lazy afternoon on vacation.
Closer to home - much closer - I shot these frames of a thunderhead roiling and rolling to the north of Germantown, MD in May of 2011. It was different every time I looked up.