It's rare that I find an adult even capable of reaching the decible level of a screeching child. In the defense of the children, however, I'd also like to say they're only doing what their parents condone--and in some cases, the tots are too young to understand how to behave in a restaurant or a movie, especially at a movie, because that's a couple of hours minimum, a long time to have to sit quietly for a wee one. This is where the concept of "babysitter" should be considered.
Amen to that. I'd say 95% of the world's problems is bad parenting.
I often hear a table full of "adults" cackling 'til my ears hurt.