As a teen, first time I bought condoms at the grocery store;
This hot(-ish) girl clerk who was selling them from behind the counter - they have to keep them there so all the awkward teens (like meself) don't just pocket them - , asked me if I wanted them large or small.
I mumbled, asking if she also had like a medium or something in between.
She didn't really get what I was saying so I had to repeat my question; she then explained they only had 24 or 6 packs and how big of a pack I wanted.
I don't think she understood/noticed my confusion/relief/pain