That episode is the Season 8 classic "The Itchy & Scratchy & Poochie Show," which also cemented The Simpsons as the longest-running animated show in history — a feat it still holds to this day.

The Simpsons Season 36 ends with an episode that not only reveals how Bart and Lisa first started watching The Itchy & Scratchy Show as younger children, and then jumps forward 35 years into the ...