Morty and Sally
An old Jewish couple Morty and Sally Rosenberg are eating breakfast while reading their Sunday paper. Morty comes upon a study that says women use more words than men. Excited to prove to his wife his long-held contention that women in general and his wife in particular talk too much, Morty shows Sally the study results, which states: "Men use about 15,000 words per day, but women use 30,000."
Sally thinks about it for a while, then finally says to her husband, "That's because we have to repeat everything we say."
To which Morty replies, "What?"