An American man is riding a train in a European country. His seatmate knows some English, and they end up chatting. The seatmate asks if the American has children. The American says no.
"Ah, so sad," says the European. "Your wife, she is impregnable?" "Well, um, that's not exactly the word," says the American. "Oh!" interrupts the European. "I mean, she is inconceivable?" "Um, not quite --" the American begins, only to be interrupted again. "Oh, no, that isn't right," says the European. "She is, what is it, she is unbearable?" "Well, actually, that's pretty much sums it up," says the American.