There are hundreds of billboards all over Gotham in Batman: Arkham Knight. You, like me, might have missed how they change over time.
What follows could be considered a plot spoiler for Arkham Knight.
Early on in the game, Batman is exposed to Scarecrow's hallucinogenic drug. This mostly ends up influencing the game's cutscenes, but there are far more subtle impacts to Batman's psyche.
If you take a look at the billboards around you in the game, you'll notice they change around:
Cradle II Grave Gaming on YouTube has chronicled a bunch of these -- it's super cool!
Part of what makes Rocksteady's Batman games so great is the absurd attention to detail.
There are even a few times where it messes with the game's statues.
What else have you noticed while floating around Gotham?