The story isn't a Darwin Award winner (as claimed), and it's not even true, according to Snopes. (Snopes does discuss why it's so believable, though. Hint: it's in the details.)
After stopping for drinks at an illegal bar, a Zimbabwean bus driver found that the 20 mental patients he was supposed to be transporting from Harare to Bulawayo had escaped.
Not wanting to admit his incompetence, the driver went to a nearby bus stop and offered everyone waiting there a free ride. He then delivered the passengers to the mental hospital, telling the staff that the patients were very excitable and prone to bizarre fantasies.
The deception wasn't discovered for 3 days.
But it is clever, and full of motivations. Use its arc as a starting point, then riff with your own hilarious (or horrific ... pick your genre) details.