Overheard conversation

I don't normally listen to other peoples' conversations. I tend to listen to my ipod and zone out while traveling on public transport.
Today however, I heard this: (between two upper primary students)

boy: "Why would she wear a bikini when she doesn't have a pubic chest?"

*silence* for a few moments

(meanwhile I'm laughing to myself)

girl: "Why don't you just say boobs?"

boy: "Because I'm not that sort of guy"

girl: "oh yeah...whatever."

I was amused for quite awhile after that

The rest of their conversation was quite amusing too, but this stuck out.