That's new

[oneiriad]

I was standing at the platform yesterday, waiting for the train to carry me home while eating my shawarma dinner, when I saw two men, dressed all in black, with ski masks and just basically looking like the thugs in an American movie involving an armed robbery. They were washing the windows on the train currently at the platform - spray and wipe and then they ran down into the tunnel that connects the various platforms and away.

Is this a thing now? Guerrilla window washers? I mean, is it a thing like those people who knit covers for traffic signs or those people who sneak-plant pretty flowers in public bits of grass? Or was it just a bit of random oddness, I wonder...