the opening to the Chevy Chase classic National Lampoon's Christmas Vacation is a pretty fun 2-D animation by Bill Kroyer involving Santa encountering Murphy's Law when visiting the Griswold house this year.
probably primarily known as the director who inflicted Fern Gully: The Last Rainforest on the world, he's worked on just about everything from being the story director of Gobots and the Animalympics. more recently, he's moved towards computer animation including work on Tron, The Green Mile, Cats & Dogs, Scooby Doo, the Coca-Cola Polar Bears, and Garfield (the one with Bill Murray) -- much of which was done at Rhythm and Hues where he resides as a Senior Animation Director these days. here's the film that got his Hollywood career started off:
nominated for an academy award in 1988, but losing to John Lasseter and Tin Toy, Technological Threat is a pretty interesting short film -- it uses hand drawn animation for the wolves and computer generation for the replacements and the blocky boss. a nice little allegory for the rise of computer animation, probably even more relevant today than it was then.