It’s Futurama, from the episode “Fry and the Slurm Factory”, which itself is a huge riff on Charlie and the Chocolate Factory.

Futurama riffs and nods to old Sci-Fi all the time, and this was just a nice throwaway for those of us old enough to know the source material.

Here’s the exchange in full:

What if the secret ingredient is people? No, there’s already a soda like that - Soylent Cola. Oh how is it? It varies from person to person.