Even when we decide we're done, I'll still take a never-say-never approach. God help the children born after their parents say they're done; they're forever labeled as an "oops". I hate that. Joke or not, it's one of those things that I don't think is funny.
http://childrensmd.org/browse-by-age-group/pregnancy-childbirth/are-you-done-yet-in-defense-of-our-5th-child/