When you freeze frame your DVD of Otto Preminger's "In Harm's Way", starring John Wayne, and Kirk Douglas, to see if the Japanese Battleship Yamato has the right number of 18 inch guns.
Kirk Douglas's character, the recon pilot, describes it incorrectly as having "twelve 18 inch guns", but when I froze the frame of the ship he sees through the fog it is correctly shown as having only three triple turrets of 18 guns.
Go figure.