4. You’ve whinged at the constant stream of foreigners infiltrating “your” city.Remember when in Back to the Future Michael J. Fox had to be really careful about changing stuff in the past and causing a rip in the space time continuum? There was a lesson there about the fragile inter-connectivity of all things. Know that every time you stand outside your favourite cafe, angry at not being able to get a seat and bitterly complaining about all these new expats arriving and ruining your Kiez, just two years before, probably in exactly the same spot, someone else was standing there and saying exactly the same thing about you, then, two years before that, someone else about them and so on and so on. That repeats all the way back to the very first ape who climbed down from the trees and decided to walk upright, who was then copied by other apes, much to his annoyance, as everything was much better on the ground in the good old days before they came along. He probably then ran off to start spray painting “Schwabenape raus” everywhere.