baby-on-board
one of the best things i saw on a car in my years of living in berkeley (and berkeley had a lot of unusual things attached to, painted or, or as cars) was an old pickup truck with a big hunk of roughed up planking sticking up vertically against the cab with an old, naked baby doll nailed to it. folks thought it was just some sicko thing till one day it dawned on -- a spoof of "baby on board"! always wanted a pickup truck here in dc to try it sometime!
jeff