Me (ringing up Customer's friend): We can definitely make you some samples. What did you want to try?
Customer: Oh, nothing really. But I spent a lot of money and I wanted something for free, too.
Me: Oh. Huh. Give me a sec. (finish transaction and dig through basket of samples we keep at the register.) Have some Happy Soap.
Customer: Oh, OK. Yay!
Seriously, if you don't even WANT anything except to for the sake of getting something for free, what's the point?