This is a possible summary:
Mark, Ethan and Tyler play Cards Against Humanity with custom cards suggested by fans on Twitter. They laugh at the absurd and crude combinations of cards, such as "Unsheathing my massive horse cock for a face full of horse cum" and "The size of my penis". They also make fun of each other, Rooster Teeth, and Mark's mom
Here are some possible facts extracted from the text:
1. The text is a transcript of a video where Markiplier, Ethan and Tyler play Cards Against Humanity.
2. The video involves a lot of laughter, jokes, and crude humor.
3. The video uses custom cards suggested by fans on Twitter, as well as cards from the game and random cards.
4. The video ends with Tyler having a laugh attack and Markiplier saying his usual outro.
5. The video has a title of "Cards Against Humanity | Part 13" and was uploaded on January 14, 2017.