When playing with Venn in their playtest, after discussing how to symbol “X” with your forearms, or wiggling fingers for “I’m starting to feel uncomfortable”, they also had us lighting drum the edge of the table with our fingers when we liked something. (It’s like that consent flower thing with the green part: “More of this!”)
And it was grand. There were so many moments where those of us that were watching the scene got to show our appreciation of something funny, or dark, or dramatic. And it’s not only our way of expressing our approval, it’s a way the players in the scene get some immediate feedback on a thing that is making others happy!
We started taking that into other games during the weekend. I’m going to start using this in my games.