We see this poster each time we ride the train into Perth (below).  The baby is holding a stop sign that says "Stop, Priority Seat for Mum and Me."  The baby's face has been "photoshopped" to appear angry - we think they used Dane's head.  We laugh each time we see it.  The intent of the poster is to reserve special seats by the doors for parents with toddlers or the elderly, etc.