Once I needed to be quickly in downtown, so I walked to the Sheraton near my home and hopped in the first taxi in line. It was the classic taxi you don't want: old unkept mercedes, nasty driver etc etc. When I told him where I wanted to go he flipped out: 'the one before you went to the airport, the guy behind you also wanted to go to the airport, and you are only going downtown for 12€!'

I politely told him that I would also prefer to sit in a clean taxi and he is free to let me go at the next kerb. But that I would make sure his behaviour is reported. That cooled him down a bit. Of course at the end I paid by card for which magically had a machine in the glove compartment