http://www.nydailynews.com/entertainment/gossip/mexican-train-domino-effect-article-1.309707

With all of the domino talk, I have not seen this particular subject brought up.

There are a great number of news articles around 2007/2008 in which it is talked about Ashton Kutcher, Demi Moore, Sharon Stone and other Hollywood types having become very passionate about a variation of dominoes called 'Mexican Train Domino's'. Following Ashton's appearance on a late night talk show in which he explains their interest in the game, my family started playing. It's fun and a lot of people can play.

It seems like with Ashton Kutcher, domino's and the slang of the word 'train' all having seeming significance in the pizzagate picture, this should be at least addressed.

There are a lot of articles on this subject. One is about Demi and Ashton playing a game with sexual favors as well. http://www.femalefirst.co.uk/celebrity/Demi+Moore-15682.html