This is from a Treehouse Of Horror from long ago. This is probably my favorite Simpsons moment, partly because of my love of Edgar Allen Poe, party because I can remember watching this with my sister when we were younger, and partly because it’s friggin’ Darth Vader reading Edgar Allen Poe.
This is the only Youtube video I could find, the audio is there but the video is just static. I still recommend it. You can find the audio and video here at this link.