Our system can get a little too hectic sometimes, because there are arguments, or someone will start screaming for no reason, or another will get too angry, and things like that. When it does, we usually play music through some headphones (speakers don't work for us well) and it'll help calm everyone down when no one will listen to any one else. Everyone will stop to listen to the music. This obviously doesn't solve this problem long term, but it works great temporarily when there's a sudden panic. And we're all okay with it, conditionally.
So, what do you guys do to help those in your system calm down, or keep calm?