Well, we - meaning my side of the family tree! - often attribute our...ummm...quirks?...fun?...to The Reilly Gene. No, not Reilly as in my daughter, but the Charley Reilly for whom she was named. There is a distinct uniqueness to the Reilly Gene, and it is universal and strong within anyone who shares that bloodline. (Case in point would be the Christmas Gifting of the Billy Bob Teeth and Ensuing Hilarity.)
The following video is of my mom's sisters family and is a perfect example of how deep running is this Gene. I also want to point out that THREE of the people in this video (my uncle and two of my cousins' spouses) are not actually of the Reilly bloodline, but are still active participants in the Festivities. Which leads me to believe, in all of my scientific research, that The Reilly Gene is actually catching, making it unique among the gene...species?
ANYWAY, watch and learn, and then tell me that you DON'T want to go and spend Christmas with them next year!