The NBA's annual Christmas Day games have turned into a tradition for a lot of fans over the years. But did you know that the first Christmas Day game was actually played all the way back in 1947 and featured a team that's no longer in the NBA? Or that there are several NBA teams that have never played in a Christmas Day game? Or that an NBA head coach was once fined for criticizing the NBA for scheduling games on Christmas? Here are 25 Things You Didn't Know About the NBA's Annual Christmas Day Games.