UFO or exploding styrofoam
As we all know by now, NASA carefully edits, slices and tampers audio / video tapes. Fortunately they missed this one or they did not believe it to have anything interesting on it. They were wrong! This video tape is archived under: Journal 123:27:46. It shows the moonwalk / EVA number 1 - site 5 in the year 1972.
So what happened:
While the two astronauts of Apollo 17 are collecting samples of the moon (rocks) one of the astronauts suddenly gets excited as he spots a series of objects flying over him.
Normally the Apollo astronauts carefully followed a "script" and so they knew exactly what and when to say but as this astronaut saw something he never seen before he does not any longer follow the script. Instead a long and not planned conversation starts. The astronaut is really amazed. Unlike his colleague, so he asks what these objects were that flew over his head. Than it becomes hilarious. Totally surprised the second astronaut does not know what to say! This was not in the script. He is however aware of the fact that they are being watched, by NASA and the public back on earth. After a short period of silence he tells "us" that it was a blast coming from the dial shaped disc of the high gain antenna on the rover (vehicle). More objects start flying over and again we hear genuine excitement.
Here is 1967sander's channel link: