“Why wasn’t I?”
“Because you weren’t.”
“Well, where was I, then?”
“You were born in this house.”
“Where in this house?”
“Where? Why, upstairs, I suppose.”
“Are people always born upstairs?”
“Usually.”
“Never born down-stairs at all? Didn’t you ever know anybody that was born down—”
“Oh, stop, Bobbert! Go on amusing your sister. You have a genius for pure idiocy. Where’s your mother?”