(I am a customer at a convenience store buying coffee. Since the holidays are very near, I want to do something nice. There is an older gentleman behind me, about 65 years old, with two cups of coffee.)

Me: *to the cashier* “I’ll pay for his, too.”

Cashier: *smiles* “Okay, that’ll be $[price].”

(I pay, and then the man walks up to pay.)

Cashier: “It was taken care of, sir.”

Man: “No, no, no, why? Here, I need to pay for this.”

Me: “I got it for you. Happy holidays!”

Man: *scowls* “Who do you think you are, some kind of good Samaritan? I can buy my own coffee.”

Me: “…I guess I was only trying to be nice…”

Man: “Well, I don’t want it!”