I understand the idea that it’s not a desirable thing if too many people are laughing and chatting and kicking back during principal photography (Brian De Palma used to frown at same). But if you’ve even hung out on a set you know it’s all about waiting for the director and the dp to create the right lighting and figure out the camera movement, and that this always takes hours and hours. So denying people the option of sitting down (even in jest) is, like, “what?”