The jokes have been wearily predictable. The news that Harrison Ford is to return to the silver screen as Indiana Jones, some 18 years after what was billed as his Last Crusade, has prompted a deluge of dodgy ageist puns. The 66-year-old star is ironically rebranded as Indefatigable Jones, and the film, variously, as Raiders of the Lost Memories, The Saviour of a Lost Art, and The Temple of Zimmer. Then there are all the inevitable gags about whips being swapped for hips, as in replacement.