"I left my phone on the train, I'll just go grab it"
Either the dude runs REALLY fast, or that phone is good as gone. I'm imagining he's chasing after it and leaping back onto it mid travel, or cutting it off by running to the next stop.
Well considering the stories about leaving your phone on a table in Japanese MacDonald's being normal maybe his phone is still there, furthurmore the train he is mentioning is the crepe train car where the store is, not an actual train guys.