I heard of a someone doing the rounds of newsagencies in recent months selling gift items from the boot of their car. During the pitch claims are made and promises given. The claims sound too good to be true. They were. Newsagency have been left with stock that does not sell, products that are not as good as the slick sales pitch made them out to be.
My advice? Never buy from a sales person from whom you have never purchased previously, who walks in, unannounced, selling goods from their car.