It'll be during "Treehouse of Horror," but still.

He dreamed a dream. (via Fox)

Hate and love are often very thinly separated. Both require passion, both inspire 'mentionitis,' and both fill up our minds with thoughts of that person, day in and day out. For Sideshow Bob, the person who he has hated with all the fervor of true love will finally die at his hand. Die, Bart, die.

Show runners revealed that the impossible had become possible at an ATX Austin festival panel on Saturday. Executive producer Al Jean said:

“I hated frustration comedy so we'll scratch that itch.”
Sources: Entertainment Weekly | h/t UpRoxx