NASA TV UFOs: 
UFOs over Thunderstorm & 
UFO Executing Right Angle Turn

This video, which comes from an unknown Space Shuttle
mission, shows several UFOs, which apparently hover over
a big thunderstorm; and a UFO which executes a right angle
turn (and a second unknown object) can be seen at 2:11 minutes
into the video.

The latter UFO footage has been shown in several UFO documentary films:

http://www.youtube.com/watch?v=mviOyLDUWz0