From an Irish bartender (imagine it in your best Irish accent):
So, let me tell you the best way to make money. You put a condom machine in the women's room, and don't put anything in it. One of the girls tries to buy one. Nothing comes out. She tries again. Nothing comes out. And after that, she does nothing. 'Cause she isn't going to complain to no one about losing her money in a condom machine!