And it was Bart himself, in 2007’s Treehouse of Horror XVIII, who famously said, “Trick or treat isn’t just some phrase you chant like the Lord’s Prayer. It’s an oral contract.” ...

After all, that was the very first "Treehouse of Horror," the annual triptych of horror-themed tales that continues to be a staple of every Simpsons season to this day. And over the decades, the ...