I used to know one guy who could complement people in such a way that it did not appear that he was directing it at them at all.
For example, one Sunday afternoon, three of us walked into a restaurant in Beeville, Texas. As we were sitting down, the waitress was only about ten feet behind us and Larry said "Did you check out that great looking waitress?" She really loved the comment.
Another time we went to a concert being given by an old friend of mine, Robert Keen, at a place in Houston called Anderson Fair. During a break, we were standing out in the entrance hallway and looking at some pictures on the wall. He pointed to a picture and said something like, "If you ever get a chance, go listen to this girl sing. She is really good." A minute later, we turned around and saw her, Nanci Griffith, sitting on a sofa about five feet away grinning from ear to ear.
I always wondered if he did that on purpose or if it was an accident.