With all the talk of anniversaries, I thought I'd mention the "Summer of Hönkel" which happened in West Berlin twenty years ago.
It was a hectic period of cultural ferment and turmoil. "Hönkel" -- which I think was a beer -- was supposed to represent this vast chaotic mix.
I was reminded of it most recently by this picture in Flickr. The picture is of a supermarket that went up in flames in the course of a riot on May 1 1987. My house was across the street from the supermarket.