I once got yelled at by a Safeway employee because I didn't respond to her "have a nice day, sir" "I SAID, HAVE A NICE DAY SIR!" (just in case you live in a c

I once got yelled at by a Safeway employee because I didn't respond to her "have a nice day, sir" "I SAID, HAVE A NICE DAY SIR!" (just in case you live in a civilized part of the world, understand: this was in a place where the checker doesn't lift a finger to bag your groceries, that's your job)