"My daddy is an Army engineer," an Army brat said boastfully. "Did
you hear about my father's new invention?" asked the brat of his friend.
"What's his invention?" asked the friend dutifully.
"Well," explained the brat, "my daddy just sug-gested to build
a house for headquarters with the basement on top of the roof."
"Why?" asked the friend.
"So in case staff folks lose some important paper (which they often do,
as daddy says) they don't have to turn the whole house upside down trying to
find it."