Door to door salesmen

Have you ever been sitting at home and suddenly someone knocks on your door? You're sitting there wondering if you should just ignore it but decide to be a decent person and open it to see who it is and there stands a sales person. I have had this happen several times and i always let them in to demonstrate whatever product they are trying to sell. I have bought a cooking set off one of the salesmen before too. They make it sound so simple and affordable when they are there in front of you and it just seems to fit into your lifestyle so easily until later on your paying a payment you didn't want to pay for.  They give you the motivation to want to buy this product to make your life better and make it sound so great that you wondered how you ever lived without it in the first place.