Flaming Homer
The Flaming Homer is an accidentally created cocktail drink that was invented by Homer Simpson in Flaming Moe's.
When Patty and Selma were visiting to show the Simpsons slides of their holiday, becoming bored with the slideshow Homer decided he needed a beer. Patty explained that she took the last beer and Homer was forced to make something out of left-over alcoholic beverages.
After mixing several types of liquor together, while not paying attention he mixed in some Krusty-brand cough syrup and upon returning to the slideshow, Patty unknowingly dropped her cigarette ashes in Homer's drink, setting it on fire. He blew out the fire and discovered the drink to be much more tasty.
Homer explained the recipe to Moe, who then claimed the drink as his own, renaming it "Flaming Moe", stealing the idea from Homer. The drink became so popular with locals and visitors alike, Moe renamed his tavern after it bringing in a ton of new business based on nothing but the drink's addictive taste. Homer then got incredibly angry at Moe, and how everybody adored the drink that he invented. He showed up, laughing like a maniac at Moe and everyone, how they were "choking down your Flaming Moes, all the time wondering 'How does he do it?'" He then revealed the ingredient to be cough syrup.
Later, with no hard feelings, Moe served Homer a Flaming Homer on the house.
Before the secret ingredient was revealed by Homer, Professor Frink was hired to determine its chemical makeup by a rival bar. He managed to determine all of the ingredients save for the cough syrup (his analysis machine claimed the last ingredient was "Love" leading Frink to demand to know "Who's been screwing with this thing?!")