The phrase Baby On Board actually started at sea, where when infants misbehaved (or like the boards themselves, were knotty), they made them crawl the plank. They never made them stop the practice completely, but laws were passed that they had to put up the signs, the equivalent back then of the results of one of Obama's safety reform bills after having gone through Congress.

The boards in question were fashioned by way of infant trees, though adult trees were occaisionally known to enter into the process.

No truth to the rumor that in The Cannibal Isles it was a delicacy prepared much in the same way as planked salmon.