The San Diego zoo used to make a point of stocking all their cashiers with $2 bills, as a subtle "this is how much we bring to the local economy" indicator.
It's not a bad idea for a small business, either, until everyone starts doing it.
There's a strip club in Portland that only gives out $2 bills in change, as the minimum you should toss on stage at any one time.
What's really funny is, if you walk into any other bar in Portland and tip with them, there's a good chance the bartender will ask if you've just been to that stripclub.
It's not a bad idea for a small business, either, until everyone starts doing it.