Guy sells grandma a used car, grandkids trick him into quitting his job for a fake one: 'Should have done your due diligence'

Few things are more sinister, in an everyday sort of way, than those people who try to pass damaged goods off as being without problem, preying on the trusting, unsuspecting, or unlucky in order to turn an incredibly unscrupulous profit. These used car sellers, house flippers, and scam artists can be found hiding in plain sight—trying to pass some painted cabinets, cheap laminate wood flooring, and a sloppier paint job off as a "full renovation"—or selling a car "without issue" on Marketplace or other private sales forums. 

These people then have the gall to blame their victim for not doing their "due diligence" when their duplicity comes to light, acting as if their anti-social behavior is acceptable just because they're probably going to get away with it. There's often little recourse if they're technically not breaking the law or if a lawsuit isn't an option, leaving the person stuck with a costly lesson about the lengths the greedy will go to turn a profit. 

When a dishonest private seller sold their grandmother a faulty used vehicle, she was left without recourse. So, her grandkids stepped to even the score, tricking him into quitting his job by offering him a position that didn't exist.