In the classic movie Children of the Corn, two adults find themselves stranded in a town where all but two children have become members of an adult-slaughtering cult worshiping 'He Who Walks Behind the Rows'.
This tiny town (Gatlin, Nebraska) is overrun and all the adults murdered within a very short timespan - there are references to a few adult survivors of the initial murder-spree, but they apparently didn't last very long. We clearly see that the children have taken steps to ensure that word doesn't spread: phone lines are cut and travelers who stumble across them are butchered.
The movie completely lost me, however, when it became apparent that this had been the status quo for years. Vicky, an adult who just became trapped in town, discovers a magazine in one of the houses and says, "This is three years old." Even if the magazine (which appeared to be a TV Guide) was older when the adults were all murdered, it still implies that a long period of time had passed.
For me, this broke my suspension of disbelief completely. Is there any evidence for how a town full of children could have completely hidden the lack of adults for that amount of time? Surely they couldn't have cultivated all that corn, reaping and harvesting it, sowing new rows, and maintaining the equipment that allowed it to grow? Wouldn't the people who subsidized the corn production, or who had already arranged to buy it, be wondering where their shipments were? Where did the Children get the seed corn?
What about other things like taxes, electric bills, etc? Surely, even in rural America, an entire town failing to pay their bills or taxes for three years straight would have warranted an official investigation?