Here in the U.K. we have a very popular T.V. show called "Only Fools and Horses" which follows the exploits of a small time wheeler dealer in his dodgy-dealings selling stolen or second rate goods. In the show the main character "Derek (Del-boy) Trotter" is assisted by his hapless and slighty dopey brother "Rodney".
When I first left school and was trying to make a living playing guitar I took a day job working for a typical "Del-boy". In fact I could have played "Rodney" to a tee! This Guy had to be the most unscrupulous man on the planet. He used to run a travelling saleroom, setting up in town halls or community centres, advertising crazy non-existant deals, off-loading as much crap onto the unsuspecting public and then leaving town before they realised that the "5 piece pan set" they'd just bought was a pan and 4 lids in a box!
The thing was, this guy was so plausible and I was so naive, I believed him when he feigned surprise and outrage at the "discovery" that his latest "hot-line" wasn't kosher.
An experience nontheless.