In one episode of The Simpsons, the town is unable to raise enough money to build a statue of Abraham Lincoln (due to Marge's unavailability to sell treats because of her incarceration) and so instead is forced to settle for a statue of Jimmy Carter...
At which point one of the Springfieldianites angrily shouts,
He's history's greatest monster!
and a riot ensues.
My question is, why is Jimmy Carter considered to be history's greatest monster? I'm not fully up on American presidents, but at a glance through his Wikipedia page, it seems quite positive and doesn't show any major corruption or contraversy, or the like, leading me to think that this is a joke, in which case, I don't get it!