Now, see, if I wanted to go all high-falutin', I'd say how propaganda posters have sometimes been celebrated as a serious type of art. If they're effective, the artist is familiar with all kinds of styles and works them into the poster in ways that may be quite subtle and such.
Instead, let's just say: hey, that's kinda funny, eh?
(Apologies for having no Xmas image but I was deathly ill with the residuals of an Xmas-eve panic attack.)