Dr. Seuss' How the Grinch Stole Christmas has been one of my all time favourites, since it was the first holiday film I watched in cinemas. The Polar Express too, since the animation was unbeatable and it was dusted with so much festive feel. And lastly, Harold and Kumar (Christmas), just for the incredibly cheesy laughs.
Using Tom Hanks voice in all those six roles was a master stroke. He's so versatile, and it suited the mood extremely well. The Conductor is still one of my favourite animation characters.
Jim Carrey's take on The Grinch was awful. He should stick to playing stalker cable guys and penguin-owning businessmen in any future movies he plans on starring in.