Lol, I tried the "calm jar" today. I took him to his room and told him if he's feeling angry he can shake the jar (plastic bottle with coloured rice in it) really hard until he was feeling calmer. As I was closing the door he was launching it towards the door. Then I heard it launched around the room at least 4 more times. I guess he confused "shake" with "throw" :/

We shall persist!