The movie theater is a magical place for children. A huge, towering screen engulfs their field of vision, and the resounding thuds, cracks and booms from the speakers dominate their auditory senses. It can be overwhelming (and for the younger set, even a little scary), but a good cinematic experience can take a child on a journey that adults haven't been on since, well, they were kids themselves.
Now, we know what you're thinking: A lot of kids' parties take place in movie theaters. We'll grant you that, but not many kids get the entire theater to themselves. What's more, some theaters will allow you to view an older film that's no longer playing in theaters. Yes, it'll cost a bit (or a lot) more, but the experience will be richer, fuller and more magical without the screaming babies, vibrating cell phones and hushed chatter that takes place inside most modern screenings.
Also, if you're willing to pay for it, many theaters will run a special birthday message to your child on the big screen before the previews start. And really, what's cooler than cutting your cake and opening presents in a movie theater? Nothing.