Reminds me of fun times. I was at a birthday party, and there was this obnoxious girl at my table who was constantly bitching to her friends about how she doesn't date losers and blah.
At some point she was saying "Oh my god I would never date someone with a small penis... really that's so bad! How could he satisfy you? Don't you agree??"
Her friends: "eh.... well...." (embarassed)
Her: "Anyway, is it true that EVERY guy has measured his penis once? Oh my god that's so GROSS!!"
I chime in: "Of course it's true! Naturally!"
Her: "Eww that's gross!!"
Me: "So don't tell me you've never measured your breasts before."
Her: "Well, no I haven't!"
My friend has a stroke of genius: "Then you're wearing the wrong bra size!"
Me, looking at her boobs: "Yeah, you should buy a new one"
That shut her down for good