You're a taxi driver in Berlin, it's almost 4 a.m. on Sunday. You're tired, your mind is already set on heading home, looking forward to a cold beer, a doner kebab from Yıldız on the corner, and a post-shift cigarette. To top it all off, a summary of the Bundesliga matchday. Then you see four young women standing by the side of the road, waving. They look really attractive and seem to be in high spirits. After that stingy tourist from the US just now, this could be a nice, reconciliatory end to your shift. You indicate and pull over to the side of the road.