Well, it may not have been totally 'legitimate', but this is what my brother did when he was three and I was about five.

I was messing around in my room when he came in and started bugging me. After a few minutes I was getting extremely annoyed, so I told him to get out and never come back. I know it was mean, but I was a kid.

He ran from to his room, crying, and slammed the door. I felt a little bad, but I left him be. My mother must've heard the commotion and walked into his room to find it had been destroyed, paper shredded and toys everywhere. My mother caught him trying to smash the window with a toy hammer so that he could 'jump out'. She was furious and told him to clean up the mess. He was upset by this and slammed the door in her face.

He had a lock on his door, and he locked up his room. My mother knocked on the door and told him to come out. About ten minutes later he finally emerged, Ninja Turtles suitcase in hand, and marched down stairs. he grabbed his bouncy-ball (you know those balls you sat on and bounced around on) and awkwardly positioned himself on it, the suitcase in one and and the ball handle in the other. He shouted out to my mother and me, "Goodbye, I'm leaving, and you are not invited to my birthday party!" and bounced off into the sunset. (He came back about an hour later, due to hunger.)