I've only ever seen a handful of SpongeBob SquarePants episodes before but, as far as I can tell, the stop motion animation special It's a SpongeBob Christmas! only differs from a normal SpongeBob episode in that everything is made of felt and clay rather than being traditionally animated. The plot of the Special finds Bikini Bottom's resident evil genius, Plankton, plotting to get everyone put on the naughty list by feeding them fruitcakes contaminated with jerktonium, thus turning them all into jerks. SpongeBob himself is immune to jerktonium due to his innocent heart and overwhelming capacity for Christmas Spirit. I have to give the makers of the Special props for having John Goodman do the voice of Santa (because everything is better with a little Goodman in it) as well as climaxing the special with a song called "Don't Be a Jerk (It's Christmas)." All in all, it's a bit more absurd and manic than what I usually look for in a Christmas Special, but it's still miles away from some of the treacly, depressing crap I've sat through in the past.
(Image from strangekidsclub.com)