In this episode, Homer finds out that Moe's Tavern is going under and out of business. Homer tells him about a drink he created called a Flaming Homer. Homer makes one for him, he drinks it, and it instantly becomes a hit. Moe's Tavern gets flooded with celebrities and a bunch of people. Meanwhile, Homer isn't there. Homer gets mad that Moe stole his drink and called it the Flaming Moe. Moe realizes what he's done was cruel, and decides to tell Homer he'll share half his profits with him. However, Homer reveals the secret ingredient, Krusty's Kough Syrup, to everyone, and the Flaming Moe/Homer gets sold all over Springfield.
This is an absolute classic episode. Everything about it is fantastic - I'm not sure what it is. It's not the funniest episode in the world, but it's so well written, most will easily forgive that. Not to mention, this episode spawned its own NRG (energy) drink with the same name. AMAZING EPISODE.