That strange buzzing sound that you hear from the trees is not a UFO but a cicada. The sounds of the periodic cicadas are often heard in sci-fi movies. So if you think that you hear a strange sound, relax, it's only a huge bug.
People forget that insects are teachers too. Cicada's teach about time and living in the present moment. They live underground as larvae, then emerge as adults. For a brief while, they call to the available bugs, "Hey how about some ....?" Then they mate and die shortly afterwards. So take a clue from the cicadas and live for today.