Politeness To Customers Is A Good Rule Of Thumb

(I’m checking out a quiet, elderly customer.)

Me: “That’ll be £11.25, please.”

(The customer hands me a £20 note.)

Me: “Thank you.”

(I turn for a few seconds to sort his change, and get his receipt.)

Me: “Here’s your—”

(The customer is waving his partially amputated thumb in my face.)

Customer: “I lost that in the war you know! They gave me £30 for that! I bought my first bike with it!”

Me: “Th-that’s lovely, sir. Here’s your receipt and change; have a nice day!”