Noel de Printemps
The opposite metro platform on Paris's Metro line 6, in late November.
Printemps (spring in English) is a department store already advertising for Christmas in November, featuring a fairy whose forehead is being caressed by the poster hanger. It's a traditional message, covering over a poster that is still entirely focussed on the digital age. And the woman already carries a red Christmas bag, echoing Printemps' poster.
All of this was moment to moment, totally unposed. See a blip in this genre here, from just two days earlier!