Footage from a webcam on the Canada-France-Hawaii-Telescope on Mauna Kea in Hawaii presumed to have been caused by a test launch of a Minuteman III missile from California on June 22, 2011. The event was also captured by a camera on the Subaru telescope and witnessed by an observer with night-vision goggles. Discussion thread:
Note: this clip plays back a little fast and the playback is not perfectly smooth due to the way the frames were captured and stored. However, the timestamps on the bottom are accurate.