Perhaps you’ve heard this story about Sir Winston Churchill and Lady Nancy Astor, who apparently had a famous rivalry. Astor was the first woman to sit as a Member of Parliament in the House of Commons (1919). Her Wikipedia page notes her quick wit and, though they are poorly documented, her trading of insults with Churchill. One rumored exchange says Churchill disliked her being in parliament, saying that having a woman there was like being intruded upon in the bathroom. Astor replied, “You’re not handsome enough to have such fears.”
A familiar anecdote has the viscountess in a disdainful state of her prime minister. She says, “If I were your wife, I’d poison your coffee.” Churchill replies, “If I were your husband, I’d drink it.”
Astor’s Wikipedia scholars attribute this quote, not to Churchill, but to his marvelously funny friend, Lord Birkenhead. I can’t suggest Birkenhead did not have this exchange, but I’m fascinated to learn that the insult is much older than he, Churchill, or Astor. The Quote Investigator, my new favorite website, reports the earliest recording of this joke comes from an 1899 Oswego, New York, newspaper. It was completely anonymous, being passed off as something the reporter overheard on the subway. The account was picked up by many newspapers, so by the time Birkenhead and Astor may have conversed, it would have been an old joke.
What’s more amusing is many people have claimed credit for it or given it to others. When Groucho Marx told the joke in 1962, he told it of George B. Shaw insulting a woman in his audience. In 1900, a comic named Pinckney claimed to have invented the dialogue a short time before the interview and that it had already worn itself out by flying around the world.
So if Lady Astor actually told Churchill or Birkenhead that she would poison them if they were married, she had plenty of opportunity to know she was setting herself up for a great joke.