The Simpsons Season 3 Episode 10 (11/21/91)
When Homer teaches Moe a secret drink he made that involves cough syrup and lighting it on fire, the "Flaming Homer," Moe steals the recipe for his bar. Once Moe's becomes a hit, he claims the recipe as his own. Eventually, Moe almost sells the recipe for $1,000,000, but Homer gives away the secret ingredient to the potential buyers. Moe reveals he was planning on splitting the million with Homer. D'oh.