Robert De Niro gets into a fist fight with Sylvester Stallone. Leonardo DiCaprio does bumps of blow off a stripper’s breasts. And Joaquin Phoenix has phone sex ... with his phone? All of which can mean only one thing: wholesome holiday entertainment for the entire family, starting on Christmas Day. But Ben Stiller takes the PG route in his latest, and there’s much to admire in the new Nelson Mandela biopic. We review all those movies this week, and pick the best films of 2013.