(1)
WHY CAVIAR COSTS SO MUCH

(2)
WHY I LIKE A ROUND BARN

(3)
WHY THE COAL SUPPLY IS SHORT

A title may attract attention because of the striking character of the
idea it expresses; for example:

(1)
WANTED: $50,000 MEN

(2)
200 BUSHELS OF CORN PER ACRE

(3)
FIRE WRITES A HEART'S RECORD

(4)
THE PSYCHOLOGY OF SECOND HELPINGS

The paradoxical form of title piques curiosity by seeming to make a
self-contradictory statement, as, for example, the following:

(1)
SHIPS OF STONE
Seaworthy Concrete Vessels an Accomplished Fact