Watch the top 5 Simpsons Episodes of all time:

5. Team Homer Homer starts a bowling team with Apu, Otto and Moe with money Mr. Burns gave him during a ether hallucination. When Burns finds out, he unexpectedly decides to join the team.
Burns’ physical infirmity is the brunt of several great gags, from needing ether to have his nails filed to his difficulties in getting a bowling ball down the lane. Then, near the end of the episode, it’s Burns’ evilness that leads to a classic Homer line: “I guess some people never change. Or, they quickly change and then quickly change back.”
4. Marge vs. the Monorail
 After getting $3 million from a fine due to Mr. Burn's illegal disposal of nuclear waste, the town decides to spend money on a needless monorail ....built from shoddy materials. Leonard Nimoy guest voices as himself.
3. Homer the Great After stalking Lenny and Carl, Homer discovers the secret society of the Stonecutters. Homer joins, then is kicked out of and finally becomes the chosen one of the heavy-drinking club. Though the episode as a whole is (almost) unsurpassable, two near-throwaway gags are worth mentioning: Upon joining the group, Homer is told not to call 911 anymore; the real number is 912. Later, Homer has convinced his Stonecutter brethren to do good deeds by repainting a building covered with graffiti. If you look closely, you’ll see that all the graffiti consists of the word “graffiti.”
2. Lisa the Vegetarian Lisa becomes enamored of a cute little lamb, which leads to her decision to become a vegetarian. Homer can’t fathom her disgust with his meaty ways, particularly after Lisa ruins his pork- and beef-riddled barbecue.
1. Last Exit to Springfield When Lisa needs braces, Homer becomes the head of the power plant’s union to keep the dental plan. Burns tries to freeze out the union, resulting in a strike.
Simply unbeatable, from the scene in which Homer fears Burns may be coming on to him to his “Godfather”-esque daydream (“Mmm … organized crime …”) to the sadistic orthodontist who hooks Lisa up with braces that “predate stainless steel, so you can’t get them wet.” It’s also got the requisite drug sequence when Lisa gets nitrous oxide, along with cleverly integrated references to everything from “The Grinch” to “Batman” and “Yellow Submarine.” This is the episode that every self-respecting “Simpsons” geek must be able to recite verbatim.