Cup Size

I used to run a bra shop, so I'm pretty sensitive to cup size.

Today I went to our Frozen Yohurt Shop nearby to get myself a cup of Original Frozen Yohurt. I looked at the banner for my choice, Cup size A, Cup size B and Cup size C additional charges with Toppings.

I giggled and told the girl behind the counter, A please, she didn't hear me, and asked "Cup Size?" I replied, "Would like to say B but may I have an A please"