Season 22, Episode 6
Mr. Burns is given only six weeks to live due to a variety of diseases he is carrying, so he chooses to end his life by jumping off a cliff. However, he manages to avoid hitting the ground through a calamity of freak rebounds, which when he comes round, finds that he has lost his memory. This gives the residents of Springfield the opportunity to torture him for the previous poor treatment they received from his evil hand.
What can I say, it seemed that things were getting better in the series, but we are back to scraping the barrel for entertainment again with this episode.
There are movie references to
The Full Monty (the title), The Simpsons Movie (when a dome is suggested to seal the residents in), and E.T. The Extra-Terrestrial (when Burns hides in Bart's cupboard and disguises himself as one of his toys).
*Read a more detailed summary for this episode on Wiki Simpsons