The door opened and closed with a bang thousands of times. One angry son left the house and crashed the door shut and the hinge came loose. When he tried to re-enter the door wouldn't open.

"What's the matter with this door?" he shouted. "Someone let me in."

"Now, you've done it," said the mother.

"The door isn't broken," said the boy, "it is just the hinge."

"Well, I can't get it open," said the mother. "You'll have to wait until father gets home."

"You push and I'll pull," said the boy, "and we will get the door open."

They succeeded with a struggle and closed the door with a struggle. "You wouldn't think one little hinge would make such a difference,"…