A lawn company (Pro Turf Lawn Service) in Belton Missouri put one of those little lawn signs on a plastic stick in a yard I mowed just two days ago. The homeowners were on vacation so I may never had seen it if they were home. This was the only house on the block that had a sign. I suspect the LCO have seen me mow at the house before. Has anyone done this before? It seems unethical to me. What do you think?