This is the game we used to call the Lap Game, back in the New Games days.
Then it got reinvented at the US Forest Service's Deep Fun session.
Actually, it's the same as the Lap Game, with the same objective, even. Except that instead of getting everyone into a circle and going through a complex set of entertaining but somewhat tedious instructions, this game starts when someone assumes the "about to sit on a chair" position, and someone else, in an act of social chairity, gives that person the proverbial lap to sit on. And so on and so forth, forming a chain of happy sitters who may or may not wind up sitting in an actual circle, as in the Lap Game of yore.