Last week I handed a customer counterfeit money on purpose. It was satisfying.
What the heck? Do you know counterfeit money is illegal?
Yes, but I'm totally fine with it as long as I don't get incarcerated for long
Giving a customer counterfeit money is also bad for business. They'll be upset when they can't use the money anywhere else, and they will likely tell others to avoid your store. They might even report this to the police, and have you investigated.
I don't care, my store needs money. If I get reported, so be it. My customer is happy.
It's not okay to use counterfeit money. Your customer is happy now, but they won't be when they try to spend that money somewhere else. It's a terrible business practice.