This is a San Francisco International Airport/Millbrae train...

So the other night in the BART, this girl was calling out stops with the most subtle vocal expression imaginable. You could not coax this sort of thing out of an actor, I don't think, and if you did it would probably be award material. It was like she was trying to sound enthusiastic, but had clearly run out of oomph for the day. There are a variety of ways to mix announcer voice and sleepy, but I have never in my entire life heard it proportioned in quite this fashion. It was sort of awe-inspiring, in a "Zomg we live life in real time" kind of way. This wasn't something that could've been pre-recorded if you had tried.