1) Remakes are a controversial topic, with some arguing they kill originality while others see them as introducing older films to new audiences or updating films to make their age show less. 2) The highest grossing remake is 2010's Alice in Wonderland, while the highest grossing film overall is 2009's Avatar. 3) Horror and crime films have been remade frequently, with themes and details updated to reflect modern times while keeping core plots. 4) Successful remakes like The Departed expand on the original idea while adding new complexity, but failures like Psycho and Planet of the Apes make unnecessary changes that undermine the original.