My friend was at a school gathering in India and didn't realize that the balloons had been filled with hydrogen instead of helium (save on costs?). He went to pop one with a lighter and the whole bunch of 70 went up in flames and burned the hell out of his body.
Moral of the story... be careful with hydrogen balloons.
The end of the video shows "Pilot: David Windestal". The video from the sentry with its target rectangle makes it appear that it could have been autonomous, though that could have been added after.
Moral of the story... be careful with hydrogen balloons.