Fry & The Slurm Factory
Season 2 Episode 4 – first aired on Nov. 14, 1999
When Fry wins a free tour of the Slurm soda factory, he and his friends split off from the tour group and make a horrifying discovery concerning the "secret ingredient" that makes Slurm so addictive.
Fry: My God! What if the secret ingredient is people!?
Leela: No, there's already a soda like that. Soylent Cola.
Fry: Oh. How is it?
Leela: It varies from person to person.
Leela: I have never seen anyone so addicted to Slurm.
Fry: This is nothing. Back in high school I used to drink a hundred cans of cola a week. Yep, right up until my third heart attack.