"You have really pretty eyes."
I almost didn't catch it, but as a passenger was leaving the airplane on the last flight of my three day, Christmas trip, that's what he said. He didn't linger, he wasn't trying to pick me up; he said it just as if he was saying thanks for the nice flight.
I was tickled. After not seeing my family for three days, missing so many Christmas celebrations, and not having had a real meal in about as long, such a little gesture really went a long way.
The moral of this story being, if you notice something worth commenting on, do it. No matter how small or insignificant it may seem to you, it might brighten someone else's day beyond measure. I know it did mine.