Someone placed a couch in front of their house at curbside, a sign on the couch indicating it was free for the taking. The couch was filthy. Nobody in his or her right mind would accept this free gift, let alone put it in their home as an actual piece of furniture. The couch sat on the street for about a week. Even the “Free” sign survived all seven days. One morning, the “Free” sign had been replaced with a sign that read “$50.” Someone stole the couch within the hour.