Children At The Work Place

I work with adults who behave like children. I deal with it by ignoring them. Usually it works, however when did it become appropriate to throw a temper tantrum. I'm talking yelling, shaking, swearing, slamming doors. I am starting to feel like I am the crazy one and they are normal. How did I end up working with so many babies who have egos. I think the ego part of it is almost the worst. They take things so personal, feel like they should be involved in every meeting, and there opinion is the only one that matters. Needless to say I am OVER them all. I can't wait to get a break from them.