My family has been members of DVC since the mid 90s and we have been going to Disney over Thanksgiving for 16 years. As you can imagine, spending almost every Thanksgiving on property has given me a lot of my fondest memories; but my favorite happened this past Thanksgiving (2010).
My wife and I didn't get to go in 2009 because we had our first child in December and we were very excited to take our son on his first Disney trip. The day after Thanksgiving we went to Animal Kingdom and were in line to see Mickey (totally recommend character visits in Animal Kingdom by the way, the line was the shortest I've ever seen). We were probably 50 feet from the front of the line and then he spotted Mickey. Now, my son loves

almost as much as he loves his mommy - and way more than he loves his daddy so he lost his mind in his excitement.
While we were trying to him, we bumped into the people directly in front of us in line. They where very understanding and assured me that it was alright. That's when I noticed they were having a family reunion and had their 92 year old grandmother with them. Like any first timer she had her 'first visit' pin. When they got to the front of the line, the grandmother leaned forward in her wheelchair and said to Mickey, 'I've been waiting my entire life to meet you!'.
To see two people, one 92 and one 11 months, be so excited to meet Mickey for the first time will always stick with me.
That is my favorite memory and
THAT is why I love Disney.