Screaming Hypocrite

Ben and Lauren have developed competing ear piercing screams. Whenever they get excited the screaming begins. Jack did a little screaming at this age, but without a companion screaming wasn't as fun. Now that Jack has some other screamers to scream with he has developed his own, slightly lower, scream. These screams are so annoying that I find myself yelling "quit screaming". How am I going to teach them to stop screaming if I am being a total hypocrite?