Well he would, wouldn't he?
When Mandy Rice-Davies was giving evidence at the trial of Stephen Ward, charged with living off the immoral earnings of Keeler and Rice-Davies, in the Profumo Affair, she made a famous riposte. When the prosecuting counsel pointed out that Lord Astor denied an affair or having even met her, she replied, "Well, he would, wouldn't he?" (often misquoted as "Well he would say that, wouldn't he?"). By 1979 this phrase had entered the third edition of the Oxford Dictionary of Quotations.