Scratches on the train window.

Slow bunnyhopping train home - for the 3rd? 4th? time this week. All it takes is one teeny tiny signal failure and everybody starts boiling around the platform of whichever station you happen to be at like someone's poked a stick into an ants' nest.

Much easier to just stay in the corner of the train

(in the unshakeable belief that sooner or later the train will go somewhere, even if you don't particularly want to go in that direction),

rest your forehead against the glass and take a photo through the graffiti scratches of the blessedly quiet platform opposite. And then wait a bit more.