I have an aunt from Japan, she's married to my mom's brother, and they're staying at her house right now. My aunt was discussing the upcoming holidays with my mom and asked if we could have both chicken and turkey for Christmas. My mom was puzzled and asked what kind of chicken, and my aunt said KFC. My mother thought that was really strange. When my mom told me this today we had a good laugh as I explained to her how in Japan people celebrate it by ordering Kentucky Fried Chicken, because apparently the founder of the first KFC in Japan told people that this was what Americans eat at Christmas. And he knew the traditional meal is roast turkey, he KNEW that if you were eating KFC or any fast food at Christmas in the US and Canada people would laugh at you. He just wanted to sell more chicken at Christmas. I saw a video all about it a few months ago.
Also people in Japan don't really celebrate Christmas for any religious reasons, to them it's basically like people in North America celebrating St. Valentine's Day. 