me: (buys a Christmas tree, gets sirred by the worker who cuts/wraps it)

worker: (bringing tree out to my car) ma'am, i wanted to apologize for accidentally calling you sir back there

me: (genuinely warmed) thank you very much, i appreciate you coming back out here and saying that

worker: (finishes loading tree into car) have a good day, sir

me: (no longer warmed) :-\