Store will no longer accept ‘cash stored in underwear’

Toward the end of the trailer, our protagonists go on a little date by robbing a pawn shop (#relationshipgoals). On the door on the right, just next to a “Petty Forever” sign (the trailer notably featured “Love Is A Long Road” by Tom Petty) is a sign in all caps, bolded, and underlined that reads:
We will no longer accept cash stored in underwear.
Again, this is quintessential GTA environmental storytelling that lets you know that this place is full of strange, wacky behavior from its denizens.