Final answer:
The East vs. West Berlin incident involved the erection of the Berlin Wall and the subsequent protests that led to the collapse of Communist governments in Central and Eastern Europe.
Step-by-step explanation:
In the 'East vs. West Berlin incident', there were several significant events that took place. One major incident occurred on the evening of August 12-13, 1961, when East German troops erected a barbed wire fence to divide the western part of Berlin from the eastern. This division led to the construction of the Berlin Wall. Another significant incident happened in November 1989, when peaceful protesters in East Germany marched through checkpoints at the Berlin Wall, eventually leading to the collapse of Communist governments in Central and Eastern Europe.