Mysterious Farm Energy!

Something strange is going on! I had not noticed this before but we put these old aluminum irrigation pipes into the ground about two months ago, installed to a depth of 3-4 feet, with intentions to eventually install some bird netting to protect some of our fruit trees from birds. My wife noticed one pipe wobbling quite a bit this morning and we watched it for some time and it was very constent. Another pipe 20 feet away was wobbling much less. I mentioned it to our farm worker and he indicated he noticed yesterday and did a video himself. Are any of our followers a physics engineer that might be able to explain what is going on?

Видео Mysterious Farm Energy! канала Figaholics