Reese Witherspoon and Vince Vaughn rock this 2008 movie. This film is about a couple that spends their entire Christmas visiting both of their divorced parents independently, which makes for one seriously hilarious movie of holiday mishaps.
A Christmas Story
Nine years after Bob Clark made Black Christmas, he made A Christmas Story. This movie is an absolute classic. If you've ever seen the "Christmas leg lamp" or heard any stories about a BB gun taking someone's eye out, then you've probably run across this gem at some point in your life, after all, it plays for 24 hours straight on Christmas day.