Cripples only
In the late nineties, indignant ANP used her HP DeskJet 292C (purchased from now-defunct iconomy.com) to print self-righteous stickers.
I stuck one or two on cars that I spotted improperly parked in reserved spaces, generally right in front of Payne-Whitney gym. (Irony!)
My older sister sent me (via her fiance) a link to a blog describing how some Latvians have kicked this up a notch:

(translated from the original Latvian)
Ragged Edge > Media Circus Blog > Signs of the Times?
Adverbox > Disabled people awareness
Coolz0r > Marketing Thoughts > Your spine or mine
