(My job is just to fold/hang the clothes from the fitting rooms and put them back. A customer comes up to me with two identical shirts.)

Customer: “What’s the difference between a small and a medium?”

Me: “Um, the small is smaller than the medium?”

Customer: “I know that! Is there any other difference?”

Me: “Not really.”

Customer: “What kind of salesman are you? You don’t know that much about clothes.”

Me: “I don’t sell the clothes. I just fold them.”

Customer: “So you don’t know if there’s any difference?”

Me: “They’re the same thing. One is just smaller.”

(The customer hangs the medium on a rack, hangs the small in front of the medium. She compares the two shirts for a good 5 minutes before going with the small “because it’s smaller.”)