These are some favorite parking and garden items from my “Nagging Signs” collection. Kind of “Portlandia” at first glance, but with that special San Francisco gravelly aftertaste. Organized here from the passive-aggressive to the aggressive. Click to enlarge any image.
Unquiet Titles 
There used to be — maybe still are — signs in New York City that said “Don’t Even Think of Parking Here”. I don’t suppose one could actually get a ticket for thinking of it.
Joe Fineman! How nice to hear from you. Hope all’s well?
I’ve seen the “Don’t Even Think Of..” in commercially made form. Would guess, tho, that you’re talking about the days before quite so much cute was mass-produced?