Vibrating, moving, dissapearing 'star'.

My cousin, brother and I were stargazing on my parent’s lawn when we were 12, 10 and 14 years old respectfully. I observed what looked like a star almost directly overhead vibrating on the spot. I pointed this out to the others and they each observed the same. We continued to observe this 'star' for a minute or so before it abruptly started to move and very quickly crossed several degrees of the sky. Just as abruptly it stopped at its new position. The acceleration and speed was remarkable..
 Once in its new position it again appeared to vibrate on the spot. Only a few seconds later it again abruptly started to move. This time it made several zigzagging movements across a much larger area of sky, becoming more distant/ dim and disappearing. This zigzagging/ disappearing stage lasted only a second or so.
Witness indicates that the date of the incident is approximate.  PD