Thing Thing is a silly card game that we play a lot of at the office. We have cards upon cards of 'things'- places, people, objects, concepts- and we have find ways to relate them, usually with strange results. Playing two or more cards lets you get rid of them, but the category you used to relate them (leaders in their field, hard to get to, stuff I have touched recently, reasons the party didn't go well) may let other players discard cards as well, forcing you to draw new cards to compensate. It is overall a ridiculous activity, one in which each player races to either ditch cards on the turns of other players, or cleverly craft a category that is specific enough to ditch their own cards, but not include anyone else's.
You are welcome to use the deck included with the digital files, but also to make your own with whatever you have handy.