The Berlin dialect and the “Berliner Schnauze”
The Berlin dialect can be hard to understand for those not used to it. The two most striking differences in pronunciation are that the “ch” sound is pronounced as “ck” and the “g” as “j”. The grammar also contains some notable differences from that of standard German, e.g. by not distinguishing between the
accusative and the dative case. The Berliner Schnauze refers to the phenomenon of local people often standing out for their relentless frankness, thus often maybe being perceived as out of place or rude by those not from the city. Peter Lucas, a taxi and bus driver offers guided tours around the city in Berlin dialect: 

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