I'd completely forgotten about this till ten minutes ago. Milk is a documentary short from Sesame Street's "How do they make ___?" golden era, the 1970's.
Like the classic crayon film, and unlike their chatty competition over there in Mr Rogers' Neighborhood, Mr McFeely, Milk has no narration, just groovy music. Yet it wraps up the steps of milk production in a snuggly story blanket: in this case, a hungry baby is waiting for her bottle.
As I was watching it with K2, I kept thinking, "What kind of parents run out of milk like that? And what is this teaching my kid about demand forecasting and supply chain management?" And then at the end, they--well, I won't spoil it for you.