I was driving on Antelope Island in the Great Salt Lake, taking pictures of the buffalo. My wife said to me, "Something strange is happening to that cloud," and so I snapped two shots of it. I didn't really think anything more of it at the time. When the picture was developed I noticed the object at the top of the frame, which I hadn't seen at the time. There is a second object, visible in the photo which appears to have been vectoring to intercept the primary object, but was no where near quick enough. It is visible at the very bottom of the frame.