I wasn't worried yet.
There were fewer and fewer taxis, and the ones that were empty were picking up the locals.
I started to worry just a little.
And then, at the stroke of midnight, all the lights went out. Closing time for the subway — and the rest of the neighborhood ! Yikes!
We were finally able to flag down an open taxi who was willing to take us to the airport — at double fare! But at that point, we were willing to pay!