The Wishyfoo, who dwell underground near Quilbozza Beach (which is just south of Port Foozle), alternately tell the truth and tell a lie with every successive statement they make. Sometimes they start with a lie, sometimes with a truth, but they always alternate thereafter. The Wishyfoo Territory is but a medium-sized cavern; the Veritassi and the Prevaricons live next door.

SOURCE(S): Zork Zero