When Groucho Marx was once asked a long and orotund question, he replied, "Whom knows?" […] The popularity of "whom" humour tells us two things about the distinction between "who" and "whom". First, "whom" has long been perceived as formal verging on pompous. Second, the rules for its proper use are obscure to many speakers, tempting them to drop "whom" into their speech whenever they want to sound posh.Appeared in print in the Review section (issue 52,240) on 16 August 2014, page 4, column 3.
2014 August 15, Steven Pinker, “Reference and languages books: Steven Pinker: 10 ‘grammar rules’ it’s OK to break (sometimes)”, in Alan Rusbridger, editor, The Guardian, London: Guardian News & Media, archived from the original on 2023-03-27