Kim Possible: A very Possible Christmas
I timer taped this on Christmas day (or eve, I can't remember) and didn't get around to watching it until recently. In comparison to most holiday themed TV episodes, I have to say even setting aside my love for KP, this was a kick ass Christmas episode. It was well written, funny, and a unique situation for Drakken and Ron.
I can totally relate to Ron's emotional attachment to the whole snowman tradition thing. I myself have my own personal Christmas traditions that while most may find them childish and immature, I still do them around the holidays for my own sake. I still laugh at what Drakken said at the very end every time I hear it

:
"Of course after the holidays are done, the truce is over, I'm going to open a bag of freak on all of you!"