I spent one summer working as a cab driver. The cars were old and not air conditioned. All in all, it was a lousy job. One horrible hot afternoon I picked up a guy at an ice-cream stand. He was carrying four chocolate milkshakes. I knew the shakes from this stand were great and chocolate is my favorite. He jumped in the cab and handed me a shake saying "Here, one's for you." It MMD so much that I remember it 37 years later.