Unidentified Men: (Singing in unison) You're a sap, Mr. Jap, to make a Yankee cranky.

NPR: NYU Exhibits 'Yellow Peril' Collection

It was a bespectacled squinty-eyed Jap soldier portrayed as a dementedly grinning rat.

NEWYORKER: Rat Beach

Mr. DYLAN YEATS (Co-curator, Archivist of the "Yellow Peril"): "You're a Sap, Mister Jap" was one of the more famous and popular anti-Japanese propaganda songs.

NPR: NYU Exhibits 'Yellow Peril' Collection

But the plain truth is and our intelligence reports are clear on this matter the Jap forces are, more than ever before, prepared to die for the Emperor, to fight to the last man.

NEWYORKER: Rat Beach