Thank you for buying my chips.

I was in the grocery store yesterday and on the snack food aisle I went straight to the small section of Golden Flake products and picked up a bag of their potato chips.  I didn't notice that the Golden Flake man was there stocking the shelf until he said, "Thank you for buying my chips."  I was struck by the sincerity with which he said it; he was genuinely grateful that I was choosing his chips over Lay's and the (much cheaper) store brand.  I responded, "You're welcome.  I like yours the best."

You just never know how something so simple and so routine in your day may have significance (for good or bad) to someone else.