A B-2 bomber flying over Gillette Stadium in Foxboro, MA (home of the New England Patriots) on opening day. The non-reflective surfaces of the plane combined with the fact that most of the light was coming from above it prevented the visibility of any real detail. Even the close-up pix I took look like I glued a triangular piece of construction paper on a photo of the sky.
I love fly-bys. Truly awe-inspiring.