Only time I've genuinely flustered my dad, I think. Happened at the dinner table last night.
Me: "I guess it's time I admit these shorts don't fit me any more."
Sister: "No, they fit your hips fine, they just don't fit your crotch."
Me: "...My crotch?"
Sister: "Yeah, your crotch isn't big enough for those shorts."
Me: "I don't understand. What do you mean by that?"
Sister: "They hit your hips and butt right, but they're not tight enough on the front. Your crotch."
Me: "Ooooh. So, my crotch isn't big enough?"
Sister: "Yeah."
Me: "Can we stop talking about my pubic mound please?"
My dad left the table and wouldn't say a word for five minutes, and my sister couldn't stop laughing.
Eventually I complained that my father's been walking about the house naked for years and years but I'm not allowed to be frank about my body.
TL;DR CROTCH JOKES