Actually, I do this "Compliment a stranger" thing quite often, because I work at a gas station and there are so many people there every day. So I tell them I like their sweater, their perfume or their purse. Nearly every time when I notice something I like on a customer I tell them. They always smile really cute and tell me "thank you", sometimes they tell me where they bought the sweater or something like that. And they always walk out with a smile on their face, sometimes big, sometimes small. I really like that.