Mother of a son serving in an Army unit told her neighbor, "I wrote to the commander of the unit where my son was and asked him what he thought of Jim."
"So what?"
"He says Jim is a great gold brick. Now I wonder what 'gold brick' may mean?"
"Probably something very good," mused the neighbor. "Everything that is gold must be good. Can't be bad?"
"No", agreed mother, "but what is 'brick'?"