It doesn't matter how old you are. You can throw a tantrum.

1. Desire something vehemently. Whether it be the cookie that your mother refused to buy you or the million-dollar business deal that just won't come through.
2. Refuse to stray away from that desire. Be stubborn.
3. Make a scene. Stomp your feet. Scream. Yell. All that good stuff.
4. Recieve instant gratification.
5. Repeat.