The phone line as gone dead. Not even a dial tone. Looking out through the window, you can see that the line has been cut. The screaming children have formed a human pyramid, and cut the line! The nerve!
On top of that, they haven't stopped screaming, either. You now have a pyramid of screaming children on the lawn -- what will the neighbours think? This tops it all!
You go outside, and slam the door behind you. Only it's a screen door, and it doesn't slam at all. In fact, all you've succeeded in doing is flustering your show of indignation, and warped the door.
Even angrier, you stomp up to the screaming kids and yell: