This made me tear up, too. I talked about my grandma passing away, just days after Christmas a few posts up. December 23, 2006 is the last day I saw her alive. She was at the annual Christmas party that my parents have every year, and she was so animated and talkative with everyone, and she made the comment to my aunt and uncle on the way home how much she had enjoyed having this opportunity to be with every one. Being this talkative was out of character for her as her hearing was really bad due to radiation treatments to her skull. my mom is sure that she knew this was the end.
I had been a bit of a social butterfly that night and only spent a few minutes visiting with her thinking we would be celebrating Christmas with her in just a few days. She collapsed the next day and never woke up. While I am glad that my last memory of her is of her being at a Christmas party, had I known that was the last time I would talk to her, I wouldn't have left her side. i struggle with this regret, and it is intesified at Christmas.