In the latest retelling of Charles Dickens' "A Christmas Carol," a CGI-animated film using motion-capture technology, Carrey is almost unrecognizable as Scrooge (in four different stages of life) and the Ghosts of Christmas Past, Present and Yet to Come. Of course, it's not the first time rubber-faced Carrey has transformed himself entirely. We look back at the actor's most memorable shape-shifting work over the years.