The Cup Is Definitely Half Empty

(A woman and her twelve year-old son are buying hockey equipment.)

Me: “Okay, you’ll also need a cup & supporter for him.”

Customer: “How do I know what size he needs?”

Me: “The supporter is based on his waist size. Do you know his waist size?”

Customer: “Yes, but how do I know what size the cup should be for him?”

Me: “Well, you’d know better than me! I’d recommend the teen size.”

Customer: “No. If he’s anything like his father, he’ll need an extra-small.”