(A customer in her forties comes through my line, and we exchange pleasantries as I ring her out. It’s a perfectly normal interaction.)

Me: “Do you have your [store] rewards card?”

Customer: “No, I don’t believe I have one.”

Me: “Well, would you like to sign up?”

(The customer agrees and I walk her through the process. Everything goes smoothly and at the end, I scan her new card and hand it to her.)

Me: “There you go!”

Customer: “Yay!”

(Suddenly, the customer starts jumping up and down in joy, waving her hands and looking for all the world like an ecstatic six year old. This goes on for a while and, not knowing what else to do, I wind up jumping with her. Just as suddenly as she started, she calms down and stops jumping.)

Woman: “There, wasn’t that exciting? Now you’ll be cheery for the whole rest of the day!”

(I certainly was!)