What is My Name?

I was returning home from a work-related trip by train. I was exhausted. Little before the train arrived the station I called a taxi to wait for me when the train would arrive. The clerk in the phone asked for my name for the reservation. I told him my name, which is Minna Koistinen. When I walked at the station towards the taxi lines, a driver stepped out of his car and asked: “Kostiainen?” I corrected him in a straightforward manner: “No, it is Koistiainen“. I sit in the taxi and had a strong feeling that something went wrong. I tried hard to remember my family name, but it took many minutes to remember the correct form of the name. At the moment I remembered my name I bursted to laughter and could not stop laughing…