Sometimes a 2-3 year old will throw themselves down screaming regardless of the discipline. ;) If Terra acts up in public, we give her one warning, and then if she continues she's removed from the store/place. I think it's actually only happened twice. Once at a grocery store and once in a restaurant, and she was promptly removed while the other parent finished up the shopping/packed up food.

9.5 times out of 10, she's an angel.