There’s a silly Monty Python sketch from a half-century ago that some of you surely remember, and it spawned an enduring meme — though we didn’t have that name for it then. In the scene, a hapless ...

21st May 1974: From left to right, John Cleese, Neil Innes, Michael Palin and Eric Idle dressed as Arthurian knights on the set of 'Monty Python and the Holy Grail'. (Photo by John ...