An earlier letter to the editor [Piquette and Van Buren, J. Acoust. Soc. Am. 79, 179–180 (1986)] commented on an article by D. Censor [J. Acoust. Soc. Am. 76, 1527–1534 (1984)]. In his reply [J. Acoust. Soc. Am. 79, 181–182 (1986)], Censor made some observations that warrant further comment. The present letter considers in detail plane-wave scattering by a vibrating plane and thereby demonstrates analytically that Censor’s theory predicts sum and difference frequency component waves that are of the order of magnitude of pseudosound. This example also illustrates that the parametrically growing sum and difference frequency component waves generated nonlinearly overwhelm those predicted by the Censor theory within a fraction of a wavelength of the scatterer’s surface.